The sheriff's office said it began investigating on Dec. 20 after a tip about an alleged assault at Southeast Collegiate Preparatory Academy at 16683 Highway 125 East in Halifax.
The tip alleged that a coach physically assaulted a student a few days earlier.
After an investigation, Paul Anthony Nicholson Jr., 37, of Enfield, was arrested Thursday. He was charged with felony assault by strangulation.
Nicholson was taken before a magistrate where he was given a $2,500 bond and a Jan. 3 court date.
No other details were immediately released.