The five-time Grand Slam champion was spotted out in Los Angeles on Tuesday, just one day after announcing that she failed a doping test at January's Australian Open.
The Russian tennis star looked to be in good spirits as she left Whole Foods carrying a grocery bag.
The 28-year-old sported an all-black ensemble (except a pair of white sneakers) with dark sunglasses.
Sharapova admitted on Monday that she tested positive for meldonium, a drug that can boost an athlete's endurance and rehabilitation by increasing blood flow.
"I did fail the test and I take full responsibility for it," she said during a news conference in Los Angeles Monday. She noted that she has taken the drug – prescribed by her doctor under the name Mildronate – for the past decade.
It had not been a banned substance in the tennis world until this year.
"I received an email on 22 December from WADA [World Anti-Doping Agency] about the changes happening to the banned list and you can see prohibited items, and I didn't click on that link," she said Monday
The International Tennis Federation subsequently suspended the athlete, while Nike and other sponsors distanced themselves from the star.
Another tennis superstar, Serena Williams, addressed the controversy at a news conference on Tuesday alongside Caroline Wozniacki, saying Sharapova showed "a lot of courage and heart" in making the announcement, the Associated Press reports.
"I think most people were happy that she was upfront and very honest and showed a lot of courage to admit to what she had done and what she had neglected to look at in terms of the list at the end of the year," Williams, a 21-time Grand Slam champion, said.
"As Maria said, she's ready to take full responsibility and I think that showed a lot of courage and a lot of heart. And I think she's always showed courage and heart in everything that she's done and this is no different."