The Commerce Department is exptected to announce today guidelines for determining which exports, temporarily banned from sale to the Soviet Union, will be banned permanently in response to the Soviets' invasion of Afghanistan, sources said yesterday.

Commerce and other Administration officials are trying to formulate regulations concerning the export of high-technology and agricultural products to the Soviets, although sources said last night that no decision has been made on what technology items will be affected.

The review of regulations regarding those exports by Commerce was prompted by President Carter's directive last Friday to sharply reduce shipments of American grain and other exports to the Soviets as a result of their "callous violation of international law."

In addition to curtailment of exports of high technology items such as computers, Carter also cut Soviet fishing rights in American waters and deferred some Soviet-American cultural and exchange programs.

Sources said last night that although all licenses for exporting to the Soviet Union have been suspended, any items already loaded on boats or planes for shipment will be delivered.

Commerce officials yesterday met with a group of business people to determine how the President's directive should be implemented and what impact it would have on the technology industry, sources said.