DAVOS, SWITZERLAND, FEB. 3 -- The Soviet Union "has no interest at all" in joining the World Bank and the International Monetary Fund, Ivan Ivanov, the leading Soviet diplomat in charge of foreign economic relations, said today.

"We do not believe that the international monetary system is being managed properly," Ivanov said in an interview following an address to the World Economic Forum here.Therefore,the Soviet Union could not give its "whole support" to those institutions, he said.

Ivanov implied in his speech, however, that the Soviet Union still would be interested in joining the General Agreement on Tariffs and Trade, a coordinated set of pacts governing trade among dozens of nations.

It had been assumed that the Soviets were eager to join the World Bank and IMF to get the benefit of loans and technical advice from these international groups, and were seeking to soften American opposition to their membership.

At last year's Davos World Economic Forum, Ivanov invited Western businesses to invest in the Soviet Union in joint ventures that would stimulate Soviet exports. That friendly attitude was interpreted then as a subtle show of interest in the World Bank and IMF.

But Ivanov said today that any such interpretation was wrong, and that his expression of "no interest" was a restatement of policy, not a change.

Last month, a National Security Council report said the United States continued to oppose Soviet membership in the two international monetary organizations, but the report's language was interpreted by some as less rigid than previous expressions by the Reagan administration.

Soviet spokesmen in the past have complained that the United States dominates both the World Bank and IMF, and said the international monetary system focuses too heavily on the U.S. dollar. Ivanov denied that the Soviets' current lack of interest in IMF membership, which is required for bank membership, stems from the IMF requirement that its members' currencies be convertible.

Nonetheless, Ivanov said in his speech today that convertibility of the ruble is not likely until the second half of the 1990s. That appeared to some observers to be a delay in the timetable for convertibility.

Ivanov's return engagement this year in Davos, with a large delegation of Soviet trade and economic experts, was heralded by managers of this forum and drew a large attendance from among the more than 700 world business leaders attending the forum.

He said that efforts were being made to cut bureaucratic red tape to accelerate the process of foreign investment in the Soviet Union through joint ventures. Ivanov said that 23 joint ventures had already been concluded since more liberal policies had been adopted, and that 18 of those were with businesses in nonsocialist countries. Some 40 others are in process and there are 260 additional offers under consideration.

"From now on, the system will be more flexible, with more autonomy for {individual} state planning agencies. We are trying to do this in a most businesslike way," he said.

He said priority is being given, in order, to joint venture applications involving machinery and equipment that will help modernize the Soviet industrial base; machinery and equipment to help modernize agriculture; chemicals, and consumer products. In response to a question, he said there could be joint ventures in "the financial area. In the near future, we will come up with something."

He acknowledged great pressure from Soviet consumers for additional supplies of products, and said that the policy through the end of this decade will be to give preference to supplies from developing countries for joint ventures to create such products.

In pursuit of joining GATT -- a move until now rebuffed by the Western powers -- the Soviets will make an effort to improve Soviet trade statistics, follow Western customs rules and apply a trade classification system more compatible with those of its foreign trading partners, Ivanov said.