Maroulis is taking over the role of Sammy, the dimwitted friend of Robbie Hart, who is played by Stephen Lynch, Playbill reported Friday.
Also featured in the new musical at the Al Hirschfeld Theatre in New York are, Richard Blake, Kevin Cahoon, Felicia Finley, Rita Gardner and Amy Spanger.
Maroulis graduated from both the Boston Conservatory and the Berklee College of Music, he then went on to train as an apprentice at the Williamstown Theatre Festival and appeared as Roger in a tour of "Rent."
In "The Wedding Singer," "it's 1985 and rock-star wannabe Robbie Hart is New Jersey's favorite wedding singer," said the producers.
"He's the life of the party-until his own fiancee leaves him at the altar. Shot through the heart, Robbie makes every wedding he plays as disastrous as his own. Enter Julia, a winsome waitress who wins his affection. Only trouble is Julia is about to be married to a Wall Street shark, and unless Robbie can pull off the performance of the decade, the girl of his dreams will be gone forever."