Appusamy (48), headmaster of the school at Kotakkal, was arrested following complaints lodged by parents with District Child Welfare Officer, Deepa, that he had been misbehaving with their class 3 and 4 wards, police said.
All the parents hail from Jharkhand.
The headmaster was later remanded to custody and lodged in the sub-jail in Coonoor, police added.