and course work finished in doctor degree course at Graduate school in south korea.
what is that? Do you have PhD? I think in western Europe it will be much easier for you to find a job. Here in other than IT industry knowledge of Polish is necessary. Moreover you probably need work permit, so it's another obstacle. Nevertheless you can try. Maybe there is some international company for which your experience would compensate lack of Polish language knowledge. I guess you can get an average salary.
Check this topic for job portals URLs: polishforums.com/work-43/look-job-poland-21030/
some random example from google:
bing.com/search?q=simulation+engineer+Warsaw
jooble.com.pl/search-vacancy-pl/rgn-Warszawa/kw-simulation-engineer
njobs.pl/praca-simulation-engineer.html