Sudan's military ruler, who has said he would reduce his nation's dependence on the United States, is sending a high-level delegation to the Soviet Union next month, according to reports yesterday from the Sudanese capital.

Similar reports that Gen. Abdel Rahman Swar Dahab would visit the United States at the same time to balance the Soviet visit were disputed yesterday in Washington.

"I have no information whatsoever that such a visit by Swar is contemplated," State Department spokesman Charles Redman said in response to a reporter's question.

News services, however, yesterday cited announcements by Egypt's official Middle East News Agency and the semiofficial Al Ayam newspaper in Khartoum that Sudan would send a delegation to Moscow in September while Swar visited the United States.

Quoting the Khartoum newspaper, The Associated Press said the delegation to Moscow would discuss "the normalization of bilateral relations and the promotion of mutual cooperation in all fields, centering on military cooperation." Leading the delegation will be Gen. Tajeddin Abdullah, deputy chairman of the 15-member ruling military council, the AP said.

According to United Press International, government sources quoted by the newspaper said the delegation would focus on increased military aid, with the Sudanese government not ruling out the possibility of Soviet military advisers coming to Sudan.

Another State Department official, who said he had heard of a possible Sudanese visit to the Soviet Union, maintained that "there has been no drastic change in the relationship" between Khartoum and Washington since the coup. He added that relations have remained "cordial."

Swar's itinerary is to include an address to the opening session of the United Nations General Assembly in New York and a meeting in Washington with President Reagan, the news agencies said.

The State Department official said there were "no plans for Swar to meet with the president." But the official said such a discussion might be arranged if Swar attends the General Assembly session.

"We haven't received anything confirming this visit," said Ismaq Gabbani, information officer at the Sudanese Embassy in Washington, who added that he also knew nothing of the reported plans to visit the Soviet Union.

After seizing power from ex-president Jaafar Nimeri in a bloodless military coup April 6, Swar said he would steer Sudan away from its traditional close ties to the United States, toward a more nonaligned posture.