The former defender will re-join the club on September 1 with a day-to-day coaching of both the Under-21s and Under-18s.
"I'm grateful to West Brom for inviting me back in - I feel like I've come back home," Moore said.
"I'm a more experienced coach now and know what's needed to make that transition from youth level to the first team.
"I had other good job offers but I've got a lot of passion for the club and it is almost like unfinished business for me."
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