The accused was held yesterday after he misbehaved with the girl inside a theatre at Fun Valley, SHO Doiwala Pankaj Gairola said.
The girl who was visiting the amusement park along with her parents, had gone to the theatre alone to watch a 3D movie, he said.
The accused fled the spot after the girl raised an alarm, police said, adding he was later nabbed from Station Road at Doiwala.