WHO needs Adam Sandler when you’ve got . . . Stephen Lynch? So say the folks who are bringing “The Wedding Singer” to Broadway.

Veteran producer Margo Lion – whose big fat idea it was to turn John Waters’ film “Hairspray” into a big fat (and profitable) musical – is teaming again with New Line Cinema, this time to bring the 1988 Sandler hit to Broadway, where it starts previews March 30.

“We’re not here to put the movie on the stage,” Lion says. “We want to reimagine it. I think Stephen’s going to be a big new star!”

For his part, Lynch – an affable Michigan native best known for singing his own, comic lyrics – says he’s made “a concerted effort” to stay away from the movie, at least until he gets the part of Robbie Hart, New Jersey’s No. 1 party animal, under his belt.

“I do comedic songs for a living, so I’m used to singing and playing guitar,” Lynch tells The Post. “But when you have to do that and dance and act, that’s where it gets tricky. That’s what rehearsals are for.”

Set, as the film was, in the ’80s, “The Wedding Singer” – about a wedding singer and the waitress who saves him after he’s jilted at his own altar – boasts big hair and the same kind of parachute pants Lynch recalls wearing in the 10th grade.

“I do have a wig,” he says, “but mercifully it’s not a horrific mullet.”

The sweet-voiced Laura Benanti (“Into the Woods”) plays the Drew Barrymore role of Julia the waitress, and has at least one memorable song, titled “Come Out of the Dumpster” (“That’s like a metaphor/Everyone has a Dumpster/A stumbling block/They can’t ignore”).

Other songs include a toast to jello shooters and the other joys of being male and single. Chad Beguelin and Matthew Sklar provide the words and music; Tim Herlihy – who wrote “The Wedding Singer” and nearly every other Sandler film (and was Sandler’s college roommate) – has co-written the book for the show.

After its world premiere at Seattle’s 5th Avenue Theatre next month, “The Wedding Singer” is scheduled to open on Broadway on April 27.