"One hundred and five against Australia is very special to me," said Sarwan, whose runs helped West Indies reach 371 for six at the close of the fourth day after they were set 418 to win.
"It's the best I've batted in Test cricket."
Sarwan, who has only previously made one test century, admitted he was frustrated at the manner of his dismissal as he miscued an attempted and sent the ball looping into the hands of bowler Brett Lee, who took an easy catch.
"I got out pulling but it's not something I want to give up on. It's given me a lot of runs and I've just going to have to be more selective," he said.
"I didn't execute the shot properly and I was disappointed, having got that far again."
Sarwan was impressed with 20-year-old off-spinner Omari Banks, who shared in an unbeaten 83-run seventh-wicket partnership with Shivnarine Chanderpaul as they took West Indies within 47
"I think Omari has given us positive vibes, it's good to see a young player come into the team and bat so positively, that is something that has been lacking in the batting department," he said.
"We need to be tougher and play more positive cricket and believe in ourselves."
Australia wicketkeeper Adam Gilchrist denied that his team had become overconfident after dismissing Brian Lara for 60 to leave West Indies 165 for four.
"I don't think we underestimated Shivnarine Chanderpaul or Ramnaresh Sarwan or Banks. We did concede some runs later in the day, but I think tiredness had something to do with that."
"We're still in it, one early wicket puts all the pressure on them but it was a great chase by their guys."