White House national security affairs adviser Richard V. Allen said yesterday that he has not been told that President Reagan is about to replace him with Deputy Secretary of State William P. Clark "or anyone else," nor was he consulted about the president's reported decision to upgrade the post.

Allen, who has been on administrative leave from his job, made his comments after The Washington Post reported yesterday that the president had decided to elevate the job of national security adviser and was expected to ask Clark to replace Allen in that post.

Clark's possible move to the White House job awaits a final decision by Reagan on whether to retain Allen, who has been cleared of any illegalities by the Justice Department.

But Allen still awaits a White House counsel's review of whether White House codes of conduct were violated in his contacts with former Japanese business associates and by his listing of incorrect dates on his financial disclosure forms.

One administration source said yesterday that Allen had been told unofficially that the president plans to replace him with Clark. But Allen said in a telephone interview this was "categorically not so."

"I have never been told that I was being replaced by Clark or anyone else," Allen said. "The first time I heard of this was by reading The Washington Post on New Year's Day. Since that was my birthday, it was the first of my birthday gifts for the day."

He said he has spoken with a number of presidential aides the last couple of weeks, but not with Reagan. And he expressed the belief that he will return to his White House job soon.

"One of my beliefs is that President Reagan is a fair and just man," Allen said.

Allen said he was not consulted about the study of the National Security Council staff operations recently completed by presidential counselor Edwin Meese III.

Meese recommended to Reagan that the job be elevated so the adviser reports directly to Reagan rather than through Meese, as Allen has done. "The idea, of course, makes sense," Allen said.

In Palm Springs, Calif., White House deputy press secretary Larry Speakes yesterday said only that Reagan has before him several recommendations prepared by Meese for revamping the national security machinery, but he added that no decisions have been made.

Other officials confirmed that Reagan is likely to decide on the new structure for the job within a week and that the aim is to give the national security adviser greater authority and direct, daily access to the president.

Allen has been on paid leave pending the outcome of a White House review of his conduct in receiving a $1,000 honorarium intended for Nancy Reagan and accepting three watches from Japanese friends. Allen says the money was put in an office safe and forgotten about for eight months.

From the start of the Reagan administration, Allen has maintained a low profile, in keeping with the desire of Reagan and Meese to avoid the power struggles that developed in earlier administrations between national security advisers and secretaries of state.

Allen has continually said he expects to resume his White House post, but White House Chief of Staff James A. Baker III and Deputy Chief of Staff Michael K. Deaver have argued that he should be replaced because his conduct has damaged the president.

Speakes said the object of changing the national security structure would be to improve "communication and coordination."

Reagan yesterday continued his vacation, staying inside on a rare rainy day in Palm Springs. He worked on his state of the union speech and watched football games on television, Speakes said. He also reviewed papers in preparation for his Tuesday meeting with West German Chancellor Helmut Schmidt.

The president and Mrs. Reagan attended a private dinner at the Palm Springs home of Reagan's longtime supporter Justin Dart last night.

Reagan sent a televised New Year's message to the world through the U.S. International Communication Agency.

The president said, "This last year in the United States was a time of rededication to fundamental American economic and political concepts." He stressed that the United States had been at peace during his first year in office and he reiterated his proposal to the Soviet Union to remove intermediate-range nuclear weapons from Europe.

"In 1981 senseless violence continued to plague the world," he declared. "A great man in Egypt, a man of peace, was murdered. An attempt was made on the life of Pope John Paul, almost robbing the world of this sincere man of God."

Reagan also alluded to the March 30 attempt on his life in deploring violence around the world.