Moving to Korea

I am a highly experienced IT/Engineering Program Manager (30M) and I’ve been looking to live and work in South Korea. It’s just me, my partner (31F) and our kid. Other than finding a US company that can sponsor me, other jobs have been asking me is I have my own “Right To Work” in Korea but I’m not sure how to get this without a company sponsorship for my Visa.

If you have any advice, POCs or any information you can give to help I would really appreciate it.