Aside from the arcadey games like Battlefield 1 and Cry of War, I haven't come across a really good WW1 tank simulator yet. i think there's also several WW1 mods for the Arma series that I've heard good things about.
There has been speculation that it
might come to IL2 Sturmovik: Flying Circus... IL2 is a flight simulator, however they have expanded with drivable vehicles/tanks for their WW2 theaters, and it's done really well. With the volume 2 of their WW1 themed Flying Circus expansion, there has been a lot of people requesting tank module implementation, but nothing has been confirmed.
IL-2 Sturmovik: Great Battles is a historically based game. It is the next generation of the legendary Sturmovik series of WWII flight-sim games
il2sturmovik.com
I'll let you know if I hear anything