The 26-year-old attack-minded defender, who scored China's winner in their academic 2010 FIFA World Cup qualifying win over Australia in Sydney last month, has signed a one year contract subject to passing a medical.
Should he pass the medical, which will take place in the Austrian capital on Thursday according to FK Austria Wien's official website, Sun will then embark on his second spell with a club in Europe.
His agent Romain Woo believes that the player is ready to make more of an impact in Austria.
"From my understanding this will be different from his first spell overseas with PSV Eindhoven," Woo told www.the-afc.com.
"The first time was maybe a little bit exciting for him but Sun Xiang is more mature now and he knows how important this opportunity is to prove himself."