By car  

Option 1: Take the Bad Dürrheim exit from the Autobahn A81 (runs between Stuttgart and Singen). The highway then turns into the B27 in the direction of Schaffhausen. Pass Donaueschingen, then take the B27 to Tuttlingen. After about 2 km take the Neudingen exit, and keeping to the right at the next intersection, follow the road to SBG. The driveway to SBG is on the right, before you reach the town of Neudingen.  

Option 2: Take the exit Geisingen after Bad Dürrheim heading south. Follow the B31 towards Donaueschingen and make a left at the sign Gutmadingen/Neudingen. Drive through the villages of Gutmadingen and Neudingen, and the SBG is on the left after leaving the town of Neudingen.