You probably already know this, but law school in the U.S. is post graduate. There are several U.S. law schools that have study abroad agreements with several German universities. You might look into the programs at the German schools. The only two U.S. law schools I can think of that have German study abroad are Weidner and Duquesne, maybe. Find what their German counterparts are and go from there. See if you can talk to someone at the German counterpart schools about what you are trying to do. It doesn't sound right to me, but I don't really know how the Germans do things.
The scholarships, more than likely, will come from your end. The German schools will know more- talk to them. I wish I could be more helpful. Good luck.