...by car
A 81 from Stuttgart or Singen (exit 35), then B 27 / B 33.
A 4 (CH) from Schaffhausen, then B 27 / B 31.
A 5 to Offenburg or Freiburg, then B 33 or B 3
...by train
ICE to Offenburg, Karlsruhe, Frankfurt, Stuttgart, Rottweil, Baden-Baden or Mannheim.
Information about journeying by train can be found here
... by long-distance bus
directly to Villingen-Schwenningen (Schützenstraße, 78056 Villingen-Schwenningen).
Information about journeying by long-distance bus can be found here