There are many sports clubs offering children and youth sports. Please ask for information at the local sport clubs.
The sports offer and clubs in the state of Thüringen can be found on the National Sports Association of Thüringen: http://www.thueringen-sport.de/ueber-uns/thueringer-sportfamilie/sportvereine/?L=0
On the Disabled and Rehabilitation Sports Association Thüringen e.V. you will find sports clubs with disabled sports: https://www.tbrsv.de/