The 35-year-old, who ended his ODI career last month, will open the innings in the first of two T20 internationals against the West Indies at Metricon Stadium on Wednesday.
Finch is Australia's all-time leading T20 run scorer with 2915 runs to his credit.
Since retiring from ODIs, he has played in three T20 internationals in India where he had two promising starts, including an innings of 31 from just 15 balls in a match shortened to eight overs.
He has had time to digest his retirement from the longer format of the game after playing 146 one-day internationals in a stellar career.
"It is something that I am in no way regretting," Finch said on Tuesday.
"The thought of fielding for 50 overs doesn't excite me anymore. Twenty overs is certainly exciting. I am comfortable with the decision I have made and hopefully that will allow me to play a little more T20 for longer."
Finch was cracking jokes in the nets at practice in the lead-up to the West Indies clash and said his passion for the game had not dimmed.
"The only thing that I will miss is training. I actually love training," he said.
"As you get older people say that your love of training wears down but I love getting in the nets and trying different things. It is great fun and there is a great feel around the group."
Finch said he was hitting the ball well and that he would continue to play with the same intent that is reflected in his strike rate of 145.82.
"If in doubt, be overly aggressive. That is how we want to play," he said.
"At times that is going to come with high risk and high reward. At times it comes with no reward. That is just a part of T20 and you respect that, but I feel like I am hitting them really well and my game is in good order."
Finch is set to reunite with long-time opening partner David Warner for the West Indies series. Warner missed the recent India tour as part of his managed preparation for the T20 World Cup.
"He is great around the group. He is someone that brings energy and brings experience and class to the side," Finch said.
"No doubt in my mind he is Australia's best-ever three-format batsman so any time he is around the squad your team is better for it I think."
