Coax Cable on/off Switch?

I'm looking for a on/off type switch for coaxial cable. Whenever I leave the house, my daughter sneaks in our bedroom and watches TV, when we tell her no. I've been unplugging the coax in the basement when we go out. I'm looking for something easier now. I was wondering if anyone knows if and where i can buy an on/offf coax switch. I've searched quite a bit and cant find anything, but it seems like a product that should exist.