Hi there!

Try the Open University of England. They have PGCE programs and their study method is by distance learning or online.
Another excellent option, (the one I would choose), is the University of Southern Queensland in Australia. They have a PGCE program in Teaching second languages and you can even continue to an MA if you want to. Their method is also by distance learning or online.

Hope this helps and friendly greetings from your neighbour in Magdeburg.

Cheers!