Roeder was left searching for a coach after Kevin Bond moved to Bournemouth and he stepped in for Pearson following his exit from West Brom.
Roeder has been a fan of Pearson for some time and is delighted to have added him to his coaching staff.
"He is a high-quality coach," Roeder told Sky Sports News. "I did my Uefa A and B licences with Nigel a few years ago and he impressed me then.
"I have watched his coaching career. He has worked at international level with The FA at all youth levels.
"Bryan Robson took him to West Brom and when he became available after Bryan left West Brom and he finished his stint as caretaker manager I stepped in.
"I am very pleased to have secured his services."
