OSLO, DEC. 14 -- The Reagan administration opposes congressional sanctions against Norway for selling sensitive technology to the Soviet Union because the Norwegian government has acted "very decisively" to prevent future incidents, Secretary of State George P. Shultz said here today.

Shultz was referring to the scandal earlier this year about activities of Japan's Toshiba Machine Co. and Norway's state-owned arms company, Kongsberg Vaapenfabrikk. They sold computerized milling equipment enabling the Soviets to manufacture submarine propellers so quiet that the United States has difficulty detecting them.

The sales, which began in 1974, violated rules established by the western alliance's Coordinating Committee for Export Control (COCOM) against sale of strategically sensitive equipment to Warsaw Pact nations.

Several bills before Congress would punish offending companies by barring them from selling to the U.S. market. Norway has expressed fear that a ban would bankrupt Kongsberg because it depends heavily on sales of its Penguin antiship missile to the Defense Department, and Norwegian officials have made great efforts to calm the storm.

At a news conference here while visiting allied capitals after reporting to the North Atlantic Treaty Organization on the Washington talks between President Reagan and Soviet leader Mikhail Gorbachev, Shultz indicated the administration's satisfaction with Norway's remedial actions.

Prime Minister Gro Harlem Bruntland "described what they have done and provided assurances of their determination to adhere to COCOM rules," Shultz said. "Because the Norwegian government recognizes the problem and has dealt with it in a very decisive way, the situation is totally satisfactory from my point of view."

"We oppose the steps proposed {in Congress} because the government has acted so decisively," he added. "Sanctions would be very unhelpful and uncalled for . . . . This is not a case of seeing a problem and not wanting to do anything about it. Quite the contrary. Norway's attitude toward the transfer of highly sensitive technology is the same as ours: They're against it."

His answer indicated that the administration has accepted Norway's explanations that the sales were contrary to official policy and arranged by Kongsberg officials without authorization.

Several Kongsberg executives have been charged with violating Norway's security and export laws, and the government is reorganizing its bureaus responsible for safeguarding the export of restricted technology.

Shultz also pointedly scolded the European antinuclear peace movement, which is particularly strong in Norway and in Denmark, where he stopped before coming here. That happened when he was asked whether pressure from the peace movement had made possible the accord to eliminate medium-range nuclear missiles signed by Reagan and Gorbachev.

Shultz replied that the Intermediate-Range Nuclear Forces (INF) Treaty became possible only after NATO deployed U.S. medium-range missiles in Western Europe, forcing Moscow to realize that the price of their removal was elimination of Soviet SS20 missiles from Eastern Europe.

Recalling that West European peace activists had opposed the U.S. deployment in noisy and often violent ways, Shultz said:

"The reality is that, if the peace movement had had its way, there would be no INF Treaty. It was only by doing what the peace movement didn't want that we got the result the peace movement apparently wanted. We did it {deployment} over the objection of the peace movement. But that is what led to the situation that made possible negotiation of this agreement," he said.

"I would hope that the people in the movement would take a second look and admit that they were wrong," he added. "In order to have peace, you have to show some strength."