Sorensen made the announcement about his retirement on his Instagram account.
He wrote: "It's with great pride and a little bit of sadness, that I today officially announce my retirement from professional football. It's been an amazing journey with so many people to thank. Family, friends, clubs, coaches, players and fans...THANK YOU.
"I will be forever grateful for your support. Now the time has come to reflect and then start a new chapter in my life. Something I am really looking forward to.
"Firstly my family and I will be staying in Melbourne. In February 2018 I will organise and take on a 3500km bike ride "Ride for Kids" through 4 Aussie states to raise money for @starlightchildrensfoundation and @kidsaiddk . Staying in Melbourne I also hope to be able to continue my contribution to @melbournecity going forward."