Bo Jackson, the rookie outfielder for the Kansas City Royals, said today that he would like to play for the Los Angeles Raiders in the National Football League as a hobby ''like hunting or fishing.''

''I'm thinking about adding another hobby to my off-season curriculum, and that's all that it would be,'' Jackson said at a news conference before the Royals' game here against the Blue Jays. ''My number one priority is the Kansas City Royals.

''I have to do my job with the Kansas City Royals before I do anything else. Whatever comes after baseball season is a hobby for Bo Jackson, just like fishing and hunting.''

Jackson, who won the 1985 Heisman Trophy as a running back at Auburn, said several times this season that football was behind him. The Tampa Bay Buccaneers made him the top N.F.L. pick in 1986, but he rejected their offers and signed a three-year contract with the Royals. This past spring, the Raiders drafted him in the seventh round, but Jackson did not say whether he had signed a contract with Los Angeles.