It is generally believed that there's one in Norway (although we couldn't find it when we went looking), but that might be about it for Europe.
Even in Canada some of the operators simply laugh at you if you say you want lessons on a Beaver, and suggest that your best route is to buy one and then hire an instructor. After getting your floatplane rating and experience on something smaller and cheaper.
(I assume it's floats you're after; although a few of them have been put on wheels I have trouble imagining why anyone would want to do that.)