Communications Satellite Corp. has appointed Irving Goldstein to the new post of executive vice president as part of a reorganization to streamline management in areas where the company faces competition.

Goldstein has been president of Comsat's Satellite Television Corp., which is awaiting Federal Communications Commission licensing approval for domestic direct broadcast satellite service.

Richard S. Bodman was named president of STC, and Comsat said he will be joined in a senior management position by Michael S. Alpert. STC, Comsat World Systems Division -- which manages the Intelsat and Inmarsat businesses and Comsat Laboratories -- and directors of certain corporate functions all will continue to report to Comsat President Joseph V. Charyk.

But other operations that, like STC, are in competitive areas will be under the direction of Goldstein. These include the direction of Comsat's participation in Satellite Business Systems; the satellite systems and technical services that will make up Comsat General Corp., which will be headed by Robert W. Kinzie; the communications products businesses of TeleSystems and Amplica, which will be headed by Bruce D. Smith; the integrated systems and computer-aided design business, which will be headed by Stephen Szygenda, and environmental research and technology, which will be headed by Norman E. Gaut.

Goldstein will also be in charge of personnel, under David S. Nye; general services, under Donald E. Greer, and corporate development, under George H. Billings.

John L. McLucas will continue as president of the World Systems Division, Comsat's largest.

Goldstein, who joined Comsat in 1966 in its office of general counsel, was appointed president of STC in 1981. Earlier he was senior vice president of international communications services for the World Systems Division.

He represented Comsat on the board of Intelsat, the International Telecommunications Satellite Organization, from 1974 to 1981, serving one term as chairman of its board of governors.

The reorganization will take place over the next several weeks.