The university announced the suspension on Friday, saying that Brian Brecht will continue to be paid.
The school did not give details of allegations.
Rutgers, under the direction of President Robert Barchi and Interim Athletic Director Carl Kirschner, has been reviewing videos of practices in all sports since men's basketball coach Mike Rice was fired this month after a video was made public that showed him kicking players, throwing balls at them and yelling anti-gay slurs.
The university also said Friday that it has formed a search committee for a new athletic director to replace Tim Pernetti. He resigned amid the scandal.
The Rutgers lacrosse team competes in the Big East Conference, and is struggling this season. The Scarlet Knights are 2-11 overall, and 0-5 in the league. Brecht's team has lost 10 consecutive games headed into Saturday's home game vs. Duke.
Brecht, in his second season as coach at Rutgers, spent seven years as coach at Siena College, and was a three-time conference coach of the year in the Metro Atlantic Athletic Conference. He was hired by Pernetti on June 16, 2011, after posting 57 victories with the Saints in his final five years there.
Brecht is a New York native who played at Springfield College in Massachusetts.