SWEAT LODGE CEREMONY IN POLAND

anyone know if it is practised anywhere in Poland?

There are a tiny number of Poles who are fascinated by Native American culture, and they occasionally have Pow Wows. I attended one once, at it was quite ... amusing. The largest such group is Huu Ska Luta from Toruń. You could try asking them on their website whether they know of anybody who is into steam lodging. Here's the address: huuskaluta.com.pl

Also quite a few people who practice religions that involve sweat lodges or the Siberian equivalent. taraka.pl might be of interest.