Florida State's entry into the Atlantic Coast Conference was sealed with a handshake yesterday, and ACC Commissioner Gene Corrigan said the Seminoles would begin competing for conference championships in all sports except football in the 1991-92 school year.

"This has been a whirlwind courtship to say the least," said Corrigan, who spearheaded a seven-week drive to add Florida State. "There is nobody involved in our conference who is any happier about it than I am."

Although Florida State's football reputation is enviable, Corrigan and Florida State President Bernard Sliger said the school's emphasis on academic compatibility persuaded ACC officials to invite the 30,000-student Tallahassee (Fla.) school.

"We believe the ACC member institutions and Florida State University are well-suited to each other in the classroom and playing field," Sliger said at a news conference.

Although some details remain to be worked out, Florida State will become a full-fledged member of the ACC on July 1. Existing contractual agreements prevent the university from competing for an ACC football title for several years.

Florida State, which will begin sharing in the ACC's multimillion-dollar television and tournament package in basketball next year, also will pay a $500,000 entry fee. . . .

Sophomore forward Kristine Lilly scored three goals and North Carolina had a 37-2 advantage in shots as the Tar Heels trounced Maryland, 5-0, in women's soccer in Chapel Hill, N.C. It was North Carolina's 102nd consecutive game without a loss (96-0-6 since Nov. 24, 1985). The Tar Heels are 7-0 this season, while Maryland fell to 1-4.