Beauchamp will link up with former teammate Dean Heffernan, who is head coach of the U20's side.
“I’m looking forward to the challenge, and sharing my experiences and on how to deal with certain situations,” Beauchamp said.
“I just really hope I can help them not only along their path of being a better footballer but also a better person.
“I hope that I can instil in them what I live by, that once you get to training and you’re on that pitch that’s it. You can’t think about anything else than doing the best for yourself and for your club, and I hope I can put that across as best as I can in the assistant role.
“I’ve played with Dean Heffernan for most of my career and having the opportunity to now assist him on the coaching side of things is brilliant."