Investigators said Earl Wayne Gann, 56, allegedly inappropriately touched and kissed a 14-year-old girl in the training room of the school on June 15. The girl told school officials, who then called police.
Gann has been coaching the girls' junior varsity soccer team for the past year. Before that, he spent several years coaching children who played soccer for the American Youth Soccer Organization.
Authorities said they are concerned that Gann may have victimized other students. Anyone with information about Gann was asked to contact Ontario police at (909) 395-2949.