Simon Brown said yesterday that he expects to be on the Mike Tyson-Alex Stewart boxing card Dec. 8 in Atlantic City. Brown, who has been working out since May, plans to begin sparring today in preparation for the bout, which he said will be a 10-rounder against an opponent yet to be named.

Brown, the International Boxing Federation welterweight champion, last fought in April when he stopped Tyrone Trice at the Starplex/D.C. Armory. That was Brown's seventh straight successful title defense. As he was for his last fight, Brown will be trained by Emile Griffith. Currently, Brown is negotiating for a new promoter/financial backer and has made no commitment.

The Tyson-Stewart card already includes undefeated Julio Cesar Chavez, IBF and World Boxing Council junior welterweight champion, against top contender Kyun-Duk Ahn. . . .

Veteran Washington fighter Louis Curtis (14-5-1, five knockouts) will face Luigi Camputaro (21-5, eight KOs) of Caserta, Italy, for the International Boxing Council super flyweight title Dec. 11 at Rockville's Holiday Inn Crowne Plaza.

Camputaro, 24, is a former European flyweight champion who lost to Jimmy Tubbs last month for the USBA super flyweight championship. Tickets to the charity event and black-tie dinner will be $250 each and are on sale at the hotel.