Hardtwaldstadion, currently known as GP Stadion am Hardtwald for sponsorship reasons, is a football stadium in Sandhausen, Germany.

The structure underwent expansion in 1987/88, when a roofed all-seater main stand was added.

Further renovation works were conducted in 2001 with the addition of floodlights and in 2008 with several modifications to meet standards for the 3.

These included adding a temporary stand with a capacity of 2,500, installation of a video scoreboard, expansion of press and police facilities and the building of a VIP house.

Liga, the contract with BWT was not continued, as the company wanted to realign its sponsorship portfolios.