The former Wales international joins head coach Rado Vidosic, assistant coach and conditioning coach Ken Stead and youth team coach John Sime.
Roar fans will be familiar with Hopkins, the 48-year-old having taken control of the clubâ€™s W-League side for the past four seasons, culminating in four grand final appearances for two championships.
Vidosic said it was important for the upcoming pre-season program to have the coaching staff settled before the playing group returned from leave.
'Heâ€™s part of our family and as a club that is very important,"Â Vidosic said.
'His tactical awareness is excellent and his analytical skills will be of good value for our club.
'As W-League coach, heâ€™s already familiar with our tactics and style of play.
Hopkins has also coached on the international stage, having been involved with several womenâ€™s national teams and taken charge of the Australian womenâ€™s under-17 side in 2010.
Hopkins said he was excited to be embarking on the next step of his career, despite the difficulty in sharing the news with Roar's W-League squad.
'Itâ€™s a step forward for me and itâ€™s something Iâ€™m really excited about,"Â Hopkins said.
'Itâ€™s always hard when you do move on when youâ€™ve been working with people for a long time.
'Weâ€™ve been successful but it hasnâ€™t just been about that, weâ€™ve worked really well together.
'It was hard, but the players have wished me all the best and Iâ€™ll still be taking a big interest in them and how they develop.
Hopkins's selection for the position continues the club philosophy of developing and promoting talent from within the club structure.
Roar general manager Sean Dobson said the appointment was an important reinforcement of the club ideals.
'We believe it is important to identify and reward talent within the organisation,"Â Dobson said.