Thomas Hearns came to Washington yesterday with plans to see President Reagan, Capitol Hill leaders, District of Columbia officials -- just about everyone except a man he'd like to meet in the ring, Sugar Ray Leonard.

Hearns, the World Boxing Council middleweight champion, will have to settle for a likely spring meeting with Marvin Hagler. Negotiations for a second Hearns-Hagler fight have begun toward a May title match, according to Hearns' manager, Emanuel Steward.

"It's been expressed that Ray Leonard has no interest in fighting Thomas Hearns," said Steward, adding that his lawyer received that word from Leonard's lawyer, Michael Trainer.

Meanwhile, Steward said, Hagler has expressed an interest in regaining the title he was knocked out of, and into seclusion, by Leonard's split-decision victory in April.

But Morris Goldings, Hagler's Boston-based attorney, told the Boston Herald that Hagler "has not decided if he is going to fight again, or with whom."

Promoter Bob Arum, who would stage a Hagler-Hearns rematch, confirmed in Las Vegas there had been "preliminary" negotiations, but without the participation or concurrence of Hagler.

"Negotiations have been going on, but on a hypothetical basis," said Arum. "If there's a fight, May 16 will be the date."

Hearns, 29, became the first boxer to win titles in four weight classes when he knocked out Juan Roldan Oct. 29 for the title Leonard vacated. Defeats by Hagler and Leonard are the only blots on Hearns' 44-2 record.

Yesterday Hearns said, "The only thing that Thomas Hearns wants is the chance to get revenge with two fighters -- Ray Leonard and Marvin Hagler."

Hearns' Washington trip was to include a visit to Children's Hospital and a meeting with President Reagan on Thursday. Mayor Marion Barry will declare today "Thomas Hearns Day" in the city, marking Hearns' four titles . . .

Former Washington Redskins coach George Allen has resigned as chairman of the President's Council on Physical Fitness and Sports, a position he has held since April 1981.

Allen said he plans to devote full time to his duties as chairman of the National Fitness Foundation and to his "dream" of building a U.S. Fitness Academy in Laguna Niguel, Calif. Allen said he planned to invite Reagan for the groundbreaking before the president leaves office.

Under Allen, the President's Council initiated a U.S.-Soviet Union youth fitness testing exchange, and the first World Congress on Fitness for All to be held in Washington next August. Allen also cited in his resignation the youth work done by the council.