사내가 · 사내를
in-house, within the company
Example
다음 주에 사내 교육이 있어요.
There's in-company training next week.
Word parts
사 company+내 inside
Literally 'inside the company'; mostly used before another noun.
Good to know
Homonym warning: native 사내 means 'man, guy' — context makes it clear.