President Reagan yesterday picked four men for high-level administration posts, including two to head bureaus within the Agency for International Development, and appointed a Federal Energy Regulatory Commission member to a new term.

Jon D. Holstine, minority staff director of the House Foreign Affairs Committee, will be assistant administrator of the Asian bureau in AID and Samuel Martinez, director of public affairs for the Adolph Coors Co. in Golden, Colo., will be named assistant administration for Latin America and the Caribbean.

In the Nixon administration, Martinez was a regional director for the Office of Economic Opportunity, and in the Ford administration he directed its successor, the Community Services Administration. Holstine was with the U.S. Information Agency in the early '60s and taught at the college level for 10 years before signing on with the Foreign Relations Committee.

Reagan selected Tidal W. McCoy, an ex-Central Intelligence Agency officer and national security affairs assistant to Sen. Jake Garn (R-Utah), as assistant Air Force secretary for manpower, reserve affairs and installations. That's a switch of services for McCoy, who is a West Point grad and spent five years in the field with the Army before being assigned to the Defense Intelligence Agency and the National Security Agency. He worked for the CIA as a civilian intelligence officer.

Also announced yesterday: Robert Melvin Worthington as assistant secretary for vocational and adult education in the Education Department, Worthington is associate commissioner of higher education for the Utah State Board of Regents. His prospective boss, Education Secretary Terrel Bell, was Utah's commissioner of higher education before coming here.

The FERC member, Georgianna Sheldon, will be named to a term expiring in 1984.