The man, now an adult, contacted the department on Sunday after seeing media accounts of Sandusky's arrest, Lt. David Young at the Montoursville station said.
Young said investigators took a statement from him and forwarded it to the Rockview station for officers there to pursue.
The Patriot-News of Harrisburg, which first reported that the man had come forward, said he is in his 20s, knew Sandusky from The Second Mile charity and had never told his parents or authorities about the alleged encounters from about a decade ago.
Young declined to release the man's name or provide details about what he claims occurred.
At a news conference in Harrisburg on Monday, Attorney General Linda Kelly and state police Commissioner Frank Noonan urged any additional victims, or anyone with information that might help their investigation, to contact police.
Sandusky, 67, has maintained his innocence, his lawyer said in the wake of charges that include subjecting children to sex acts in the football team's showers on campus. Authorities say eight children were victimized over 15 years, including two whose identities have not been determined.