Meridian Police say Paul Rocchio, 50, of Boise, was arrested in Settlers Park in Meridian Friday morning.
Police say Rocchio went to the park believing he was meeting someone under the age of 16 for a sexual encounter, but was instead met by officers.
The Meridian Police Department says that they began investigating Rocchio a month ago when he started an online conversation with someone he believed to be a minor, but was actually an undercover police officer.
In court on Monday, Rocchio's bond was set at $20,000 and his preliminary hearing was scheduled for March 31.
The team made a brief mention of the development on its Facebook page.
"Dear Bronco Lax Nation: The Boise State Men's Lacrosse Club has dismissed Co-Head Coach, Paul Rocchio, from his position on the team after they learned of his actions on 3/7..."