By ESPNSTAR.com staff
The former Ajax player was most recently involved with Newcastle Jets although a serious injury prevented him from making much of an impact at the club.
He joins a Sydney side notable for their aggressive pursuit of players with proven experience in order to improve upon last season's fifth-placed finish. Most famously, they also recently snapped up Juventus forward Alessandro del Piero to much fanfare and media attention.
The 32-year-old Australian is also the son of former Sydney manager Branko Čulina and has previously played for Gold Coast United in the A-League.
Culina told fifa.com that he was grateful at being given the opportunity to return to regular football.
"It's absolutely brilliant to be back. It's something that kept me awake at night, thinking about playing again so I'm really happy and grateful to have the opportunity to continue my career with Sydney FC," he said.
"There were times I thought I wanted to give up but I knew that if I put in the effort and commitment I could get back so I never gave up on the desire to play again."
Culina was a mainstay in the Australian national team last decade and participated at the 2006 and 2010 FIFA World Cups.
He started his career with NSW Premier League side Sydney United and has played for FC Twente, PSV and De Graafschap before making his return to Australia in 2009.