Wade Boggs was not the star of the game as the Yankees won the World Series last night, but he was the obvious star of the post-game. Boggs's impromptu decision to join a police officer aboard his horse made him the most daring and most recognizable Yankee during a memorable post-game gallop around the rollicking Yankee Stadium.

''I didn't even realize what I was doing until I was halfway up there,'' said Boggs. ''I'm deathly afraid of horses. I just did it. It felt great. This is what I've been waiting for.''

When Boggs was with the Red Sox in 1986, they lost a memorable World Series to the Mets in seven games after Bill Buckner's inexplicable error helped New York win Game 6. Boggs's mother, Sue, died in a car accident in June of that year and her death and the series setback have been a burden to him ever since.

''I was out on the field tonight and I know my mother was looking down,'' said Boggs. ''She was looking down on me. In 1986, she wasn't there. She was smiling down on me tonight. She knows we won. That's a great feeling.'' JACK CURRY