The five-time Grand Slam champion was banned for 15 months for using the substance meldonium.
But in the 30-year-old's first match back in the first round of the Stuttgart Open, tennis star beat Roberta Vinci 7-5 6-3.
Sharapova's return has divided opinion but WTA chief Steve Simon defended the Russian ace.
Maria Sharapova’s return to tennis: Controversial star makes comeback from drug ban Wed, April 26, 2017
Maria Sharapova makes her return to tennis at the STuttgart Open after serving a 15-month doping ban
Play slideshow EPA 1 of 5
Maria Sharapova has made her return to tennis after a 15-month drug ban
However Bouchard, world number 59, has launched a stinging attack on Sharapova and the WTA, saying she should be permanently banned from tennis.
When asked about Sharapova's return, Bouchard told TRT World: "I don't think that's right.
"She's a cheater and I don't think a cheater in any sport should be allowed to play that sport again.
Maria Sharapova in action at the Stuttgart Tennis Grand Prix
"It is unfair to all the other players who do it the right way and are true.
"I think from the WTA it sends the wrong message to young kids: 'Cheat and we'll welcome you back with open arms'.
"I don't think that's right and [she's] definitely not someone I can say I look up to anymore because it has definitely ruined it for me a little bit."