By car, on the A 93 freeway, take the exit "Regensburg - Prüfening". Then turn right and follow the road called "Prüfeninger Straße" towards the city until you see the hospital St. Hedwig ("Klinik St. Hedwig") on your right. After you have passed the hospital St. Hedwig, turn into the second street on your right.
Parking is available in the courtyard.
Feel free to use a route planner.