Halfpenny was given a kicking coach role by Wales during the summer tour of Japan where he worked in the backroom staff of Sherratt, who has since left Cardiff to become the permanent Wales attack coach.
“I have been fortunate to work as a kicking coach with Wales Under-20s a few years ago and more recently had the privilege of working with the senior team in Japan this summer,” said Halfpenny
“This is the next step in that journey and I’m really enjoying working with Cardiff’s kickers and their young back-three players.
“There is so much talent here and if I can help them in any way, passing on my experience then that is great.”
In an illustrious career Halfpenny won 101 Wales caps, appeared in four Lions Test matches and won the Heineken Cup during his time with Toulon.
He is not yet ready to hang up his boots.
“Being a kicking coach is where I see my future but I’m still enormously motivated to play and feel I have a lot to give on the pitch,” said Halfpenny.