Undated (AP) _ Bud Grant. has decided to step down as head coach of the Minnesota Vikings and assistant coach Jerry Burns. will succeed him. Grant led the Vikings to a 7-9 record this season, his first since replacing rookie Coach Les Steckel. Steckel was dismissed as Vikings coach last year after the team posted a 3-13 record, its worst ever. ''There are other things I want to do, '' said Grant, 58. He said he was resigning ''for the same reasons I had given earlier.'' When he first retired in early 1984, Grant said he wanted to spend more time hunting and fishing. Grant coached the Vikings for 18 years including this season and led them to four Super Bowl berths - winning none. As head coach of the Vikings his teams compiled a regular season record of 158-96-5.

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Linebacker Matt Millen. of the Los Angeles Raiders says he didn't realize at the time that it was New England Patriots General Manager Pat Sullivan. he hit on the back of the head with his helmet Sunday - but he says he's not sorry he did it. The incident occurred after the Patriots' 27-20 upset victory in an American Conference playoff game, when Sullivan and Howie Long, a defensive end for the Raiders, engaged in a shouting match at the entrance to the tunnel leading to the teams' locker rooms. ''I saw somebody swing at Howie,'' Millen said. ''I didn't know who the moron was, so I swung at him.'' When he was told it was Sullivan, Millen replied: ''Oh, then it was a good hit.'' BASEBALL

With a deadline for signing with the Detroit Tigers two days away, right fielder Kirk Gibson's. agent says he and his client don't feel pressured. ''I don't think there's any downside risk from a financial standpoint in going beyond the eighth (of January) if we have to,'' Gibson's agent, Doug Baldwin, said Monday from his office in Seattle. While Baldwin and the Tigers remain at odds, Gibson was honeymooning in Australia. The Tigers reportedly have offered Gibson a $3.9 million, three-year contract. General Manager Bill Lajoie has called it their final offer.

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Bobby Floyd,. who was a teammate of New York Mets Manager Dave Johnson with the American League champion Baltimore Orioles in 1969, has been named manager of the Mets' Class A farm team at Lynchburg of the Carolina League. Floyd has managed in the farm system of the Seattle Mariners for nine years, the last three with Triple A teams at Salt Lake City and Calgary. WORLD CUP SKIING

At Maribor, Yugoslavia, Vreni Schneider. of Switzerland and countryman Michela Figini. finished 1-2 in a women's World Cup giant slalom race Monday. Figini had won the event here last year and Schneider was second. Marina Kiehl of West Germany took third. Schneider put together times of 1 minute, 14.32 seconds and 1:17.58 for a total time of 2:31.90 on the icy Pohorje Mountain course. Figini's time was 2:33.01 and Kiehl had a clocking of 2:33.37.

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At Bischofshofen, Austria, Ernst Vettori. of Austria twice jumped 111 meters Monday to win the final competition in the international Four-Hill Ski Jumping Tournament and take the overall tournament title. Franz Neulaendtner. of Austria jumped 113.5 and 107.5 meters, finishing second here and in the tournament. He moved to within one point of Yugoslavia's Primoz Ulaga. in the World Cup standings. BOXING

The World Boxing Association lightweight title fight between champion Livingstone Bramble. and No. 1 contender Tyrone Crawley, originally scheduled Nov. 27, has been reset for Feb. 16 at the MGM Grand Hotel in Reno, Nev. The original date had to be changed when Crawley suffered a hand injury. Bramble, a native of the Virgin Islands who fights out of Passaic, N.J., has a 23-1-1 record with 15 knockouts. Crawley, of Philadelphia, is 19-1 with six knockouts. TENNIS

Two-time defending Masters champion John McEnroe,. who was assessed a 42- day suspension on Dec. 16, has been reinstated and may compete in Nabisco Grand Prix tournaments and other sanctioned events, the Men's International Professional Tennis Council said Monday. McEnroe is thus eligible to compete in the $500,0900 Nabisco Masters Jan. 14-19 at Madison Square Garden in New York. McEnroe was suspended after he exceeded the $7,500 limit in fines over the past 12 months.