Dick Dull, director of athletics at the University of Maryland, said yesterday he is projecting that all six home games for the 1985 season will be sold out before the Terrapins open the season Sept. 7 against Penn State at Byrd Stadium.

Even though it will be another 10 days or so before Maryland starts its season ticket advertising push, Dull said indications are that there will be approximately 25,000 season tickets sold, up from 15,000 the last two seasons. The other opponents scheduled to play in Byrd Stadium are West Virginia, Duke, North Carolina and Virginia, with a game against Miami probably to be played in Baltimore's Memorial Stadium.

Dull is hoping to add another game to the schedule. Maryland is still at least an outside shot to be selected as one of the teams to play in the Kickoff Classic, which has been played in the Meadowlands the last Monday before Labor Day. Another team reportedly under consideration is Brigham Young . . .

LaVell Edwards, who led Brigham Young to its first national championship, was voted coach of the year by the American Football Coaches Association.

Edwards, 54, won the honor in University Division I-A -- the major college ranks -- and was honored last night along with three other winners at the Kodak Coach of the Year banquet winding up the AFCA's annual convention.

Dave Arnold of Montana State was voted coach of the year in University Division I-AA. The College Division I winner, which includes Division II of the NCAA and Division I of the NAIA, was Chan Gailey of Troy (Ala.) State. Bob Reade of Augustana (Ill.) won for the second year in a row in College Division II, which includes Division III of the NCAA and Division II of the NAIA . . .

University of Georgia police are blaming a "disgruntled student" for the disappearance of the 1942 Heisman trophy won by halfback Frank Sinkwich that was recovered six days after it vanished from an athletic dormitory trophy case. The bronze trophy, valued at $1,100, was recovered after an anonyomus tip.