There won't be a shot clock, but the NCAA's Basketball Rules Committee has decided to modify its controversial rule that eliminated most jump balls this season, Edward Steitz, head of the committee, announced yesterday in Springfield, Mass.

Under the change, the defensive team will be awarded the ball out of bounds when the offensive player is being closely guarded, said Steitz, who is also director of athletics for Springfield College. This season, the teams alternated possession of held balls, with jump balls used only to begin the game and any overtime periods. Except for the one revision, the rule was kept intact . . .

Virginia's all-America center, Ralph Sampson, has accepted a room on campus for next year, adding to speculation he may return for his senior season, a school official has reported. Sampson has until May 15 to make up his mind on turning pro . . .Dominique Wilkins, Georgia's third-team all-America forward, has decided to pass up his senior year with the Bulldogs to participate in the NBA draft, the Atlanta Constitution has reported . . .

Five high school all-stars, playing in the Roundball Classic in Pittsburgh, supported Notre Dame Coach Digger Phelps' recent charges that colleges pay to get top players, saying they had been offered bribes but declining to name schools. Bribe offers come mainly from alumni, said Andre Banks, a guard from Chicago. Richard Rellford, a forward from Riviera Beach, Fla., said he had been offered "cars and money." . . .

Many of LSU's male athletes, especially basketball players, have loaded up on easy courses to stay eligible, regardless of whether they count toward degree requirements, a report claims. Two of the most obvious easy-credit courses were abolished, said LSU Chancellor James Wharton. One course cited gave credit for touring the state by bus . . .

St. Joseph's University has officially joined the Eastern Athletic Association, popularly known as the Eastern Eight. St. Joseph's is leaving the East Coast Conference to join Rutgers, Massachusetts, Rhode Island, St. Bonaventure, Duquesne, West Virginia, George Washington, Temple and Penn State . . . Wayman Tisdale, a 6-foot-10 high school center from Tulsa, said he will visit Georgetown this week and is reevaluating his interest in Tulsa University. Tisdale said he was concerned about reports that Coach Nolan Richardson will not stay at Tulsa, but Richardson said, "I would bet I am not leaving."