Hello,
you can do a Master in OT in Germany at HAWK in HIldesheim (close to Hannover):
http://www.hawk-hhg.de/sozialearbeitundgesundheit/184120.php
They also have an Bachelor which is a bridging degree (from diploma to Bachelor):
http://www.hawk-hhg.de/sozialearbeitundgesundheit/184118.php
Another bridging degree is at Zuyd University in Heerlen /the Netherlands:
https://international.zuyd.nl/studying/infos-fur-deutsche-studenten/auswahl-studiengange/ergotherapie-bachelorstudiengang
All of those above are taught in German ;-)
Kind regards,
Ina