Jon Cary Etingoff, 54, of El Cerrito, was arrested Thursday afternoon on suspicion of seven felony offenses, including lewd and lascivious acts, said Albany police Sgt. Tom Dolter.
Etingoff is being held in lieu of $80,000 bail at the Alameda County jail in Oakland. The case has not yet been forwarded to the Alameda County District Attorney's Office.
Police would not say how the victim came in contact with Etingoff.
The investigation began Monday, Dolter said.
"We've got information that leads us to believe there are other victims," he said, but would not elaborate.
Etingoff has been a volunteer aide for the Albany High wrestling team for more than 20 years, but is not a school employee, Dolter said.
School officials could not be reached late Thursday for comment.
The victim, who is now an adult, was first assaulted when he was 12 or 13 years old, according to police.
California's Child Sexual Abuse Prevention Act, which took effect in 2006, allows prosecutors to bring charges if alleged offenses occurred before the victim's 28th birthday -- no matter when they occurred.
But it was unclear whether this case would be affected by that law.
This case follows the arrest in May of longtime Albany Middle School science teacher Kay Lynnette Sorg, 54, of Oakland, who was charged with sexually assaulting a former student.
Sorg had the contact with a middle school student in the early 1990s, according to police.
The former student, who was between 14 and 17 at the time, contacted Albany police last October, police said.
police ask anyone with information in the case to call 510-525-7300.