Work /
Poland's Internships for English Speakers w/ Polish A2 [2]
Do you have Polish citizenship? If so then your best bet would be to email the big logistics companies and some of the provate logistics schools and tell then what you are looking for - you could also try big retail companies. There is a huge shortage of people with any logistics knowledge at the moment in Poland so you have an outside chance of doing that.
Few companies run formal internship programs - only really banks et cetera.
If you are not a citizen then it's going to be difficult because no one will really want the hassle of getting you a work permit.