Warner, along with former captain Steve Smith and Cameron Bancroft were all banned from worldwide cricket after attempting to temper the ball with sandpaper in Cape Town.
Warner is now serving a one-year ban - along with Steve Smith, who was also stripped of the captaincy - for his part in the scandal in South Africa, while Bancroft is suspended for nine months. Subsequently, Warner and Smith were handed a 12-month ban while Bancroft was slapped with a nine-month ban.More news: Live score and latest updates as Mo Salah starts
Bancroft is still contracted to Western Australia and Perth Scorchers and is set to join them for pre-season training in June.
The banned Australian batsman will replace his fellow cricketer D'Arcy Short. He's also been a fine leader in the format, having led the Sunrisers Hyderabad to an IPL title in 2016. After playing in Canada, he will return to Australia for the Darwin Strike League in July.
Speaking about the signing of Warner, Stars' General Manager, Mohammad Khan said: "We are excited to bring David to the Saint Lucia Stars".More news: Elon Musk launches investigation into sabotage at Tesla
This year's CPL will be held from August 8 to Sep. 16. With 7,668 T20 runs and six T20 hundreds, fans of the CPL can look forward to him adding to that tally when the Stars get their tournament underway on 8 August.
The month-long CPL will also feature other Australians like all-rounder Shane Watson and Chris Lynn.
What do you think about Warner's addition to the St. Lucia squad?More news: A 'milestone' World Cup win kicks off celebration for Mexico