"It's official now...PGA Tour member!!" the world number 34 said on his Twitter account on Monday after the US PGA Tour season came to a close on Sunday.
Colsaerts earned enough money as a non-member in 2012 and is therefore eligible for a place on the world's most lucrative circuit next season.
World number one Rory McIlroy, third-ranked Luke Donald and number four Lee Westwood are among several top Europeans who spend the majority of their time competing in the US.
Colsaerts became the first Belgian to play in the Ryder Cup in September.
The 29-year-old left a lasting impression on American golf fans with a virtuoso performance in his first match when he was 10-under with his own ball as he and Westwood defeated Tiger Woods and Steve Stricker one up in a fourballs encounter.
The longest driver on his own circuit, at 318.6 yards he averages three yards more than the US PGA Tour's biggest hitter Bubba Watson, said that he would still commit to events in Europe.
"I will still play a few in Europe...my heart will always be back home," added Colsaerts.
- Sports & Recreation
- Lee Westwood