Earl Wayne Gann, 56, was arrested last month after a 14-year-old girl accused him of inappropriately kissing and touching her while they were alone in a training room.
The latest victim, a family acquaintance who is now an adult, has accused Gann of sexually assaulting her when she was 12 years old.
Before coming to Ontario Christian last year, Gann spent several years coaching for the American Youth Soccer Organization.
Anyone with additional information about Gann was asked to contact Ontario police at (909) 395-2949.
