Williams was also involved with last summer's victorious tour down under when he was handed a surprise call-up for the tour game against Brumbies.
Since leaving club side Ospreys in 2012, he has being plying his trade as a semi-professional player-coach with Japanese club Mitsubishi Dynaboars.
And while previously suggesting in his 2009 autobiography that he was undecided on a career in senior rugby coaching, the Welshman now appears to have firmed up his future ambitions.
"But I do enjoy it. It's great here because there is the feeling we have started from scratch.
"If it keeps me involved in rugby though, I would like to be able to coach when I come back to Wales.
"I'm working mainly with the backs and youngsters out here. It's a great place to learn."