Lt. Gen. Samuel V. Wilson, the director of the Defense Intelligence Agency, told a Senate subcommittee yesterday that the Soviet Union intends to achieve sufficient strategic superiority over the United States to enable it to "dominate" the world after a superpower nuclear war.

Wilson said the Soviets are attempting "to maximize warfighting and damage limiting capabilities" to achieve superiority "needed to wage an intercontinental war should one occur and . . . dominate the postwar period."

Another witness before the Foreign Relations subcommittee on Arms Control, Jeremy J. Stone of the Federation of American Scientists, urged the senators to oppose deployment of the more accurate MK-12A warhead and NS-20 guidance system for U.S. Minutemen III intercontinental ballistic missiles.

"For strategic stability," Stone said, "this issue is more important than any immediately foreseeable reduction in overall aggregates of strategic delivery vehicles; more important than the cruise missle; and far more important than the Backfire bomber." He urged that the MK-12A be a central negotiating issue in talks with the Soviets.

U.S.-Soviet disagreement over how to deal with the U.S. cruise missile and Soviet Backfire bomber is a major obstacle in current strategic arms limitation talks.

Stone said the MK-12A would give the United States a five-year overwhelming advantage in ability to knock out missiles in their silos and force the Soviet Union into a major effort to catch up.