Sugar Ray Leonard will fight unbeaten Ayub Kalule, World Boxing Association junior middleweight title holder, for Kalule's title this spring, Leonard's lawyer, Mike Trainer, said yesterday.

Trainer, in New York yesterday to complete negotiations for the fight, said the bout would probably take place in May or June and mentioned the Meadowlands in New Jersey, Las Vegas and St. Louis as possible sites.

Leonard of Palmer Park, last fought Nov. 25 when he regained the World Boxing Council's welterweight title with a technical knockout of Roberto Duran.

Kalule, 26, a native of Uganda, has been fighting most recently in Denmark. He has won 35 consecutive fights, 19 of them by knockout.

Kalule, a member of the 1976 Uganda Olympic boxing team, could have fought Leonard in the 1976 Olympics in Montreal, but those Games were boycotted by many black African nations, Trainer said.

He declined to specify how much money Leonard will receive from the fight, which will also be shown on closed circuit television, but he did say, "It is a very good purse." Leonard's earnings will be less that the $7 million he received from the Duran bout, Trainer said, "but they will be well into seven figures."

Fighting for the junior middleweight title, Leonard will be moving up from a 147-pound maximum classification to a 154-pound maximum.

Trainer said yesterday he disagreed with published reports that Leonard will have to give up his World Boxing Council welterweight title should he capture the World Boxing Association's junior middleweight title.

"The WBC doesn't recognize the WBA and vice versa, so I don't see how that would interfere with his title," said Trainer, adding that Leonard probably would not be allowed to keep two separate titles within the same organization.