A discussion of the possible sale of Maryland's harness tracks between owner Mark Vogel and a group including Washington Redskins lineman Mark May was postponed yesterday. A spokesman for the May group said the meeting tentatively was rescheduled for today.

According to a knowledgeable source, Vogel met earlier in the day with horseman's lawyer Alan Foreman, who is representing a group interested in buying Rosecroft Raceway and Delmarva Downs, the only harness tracks in Maryland. Foreman, a well-known figure within the Maryland racing industry, had no comment on the meeting or his involvement with a prospective buyer.

Vogel has said he will not comment on any aspect of the negotations.

A spokesman for the May group said yesterday afternoon's scheduled meeting was pushed back at the request of Vogel, who apparently was unable to attend. The group member, a Fairfax-based banker, requested anonymity.

May, a Redskins guard and tackle who has spent this season on injured reserve following knee surgery, has strong ties to harness racing. He owns standardbreds, some in partnership with Redskins teammates, and often attends the races at Rosecroft. He is not expected to take part in the upcoming negotiating session.

Vogel has said he would like to get at least $20 million for Rosecroft, in Oxon Hill, and Delmarva, near Ocean City. However, members of several interested groups have said they consider the price high. Vogel paid $6 million for the tracks in 1987 and assumed $6 million in long-term debt, which reportedly has nearly doubled.

Vogel, a 42-year-old developer, relinquished control of the tracks in late September at the advisement of the Maryland Racing Commission after it learned that he threatened track resources by pledging some $2 million to nonracing interests and using the tracks as collateral to secure financing on other projects. A week later, he announced he would try to sell or refinance the racetracks.