His father, Denis Sheridan, was a jazz musician, and was mayor of Unley from 1982 to 1985, and his mother, Margaret, and all seven children in the family were active in the community.

[8] In February 2011, he filled in as host on The Kyle & Jackie O Show alongside fellow Packed to the Rafters star George Houvardas.

[9] In 2012, Sheridan hosted the Network Ten talent show series I Will Survive, during a production break for Packed to the Rafters.

[12] In 2019, he began starring as real estate agent, Lachlan Best, alongside Kat Stewart and Steve Peacocke in the Network 10 comedy-drama series, Five Bedrooms.

The production was postponed after a petition highlighted the lack of LGBTQ representation in the show and expressed "disappointment" over the casting of Sheridan in the lead role of Hedwig, whom many believe to be a transgender character.

[25] Sometime before 2015 Sheridan and friends Emile Welman and Gabe Roland formed the singing trio California Crooners Club, after sharing their love of jazz music in Hollywood.

[26] The California Crooners Club, based in Los Angeles,[3] has performed at the Adelaide Fringe (2015, 2019, 2020) to good reviews,[27][28][29] with six shows sold out before their first appearance.

[35] Sheridan later refuted the claims that he ever came out as non-binary in an interview with Kylie and Jackie-O, he stated that a newspaper picked up the story and ran with it.

[32] On 5 March 2021, Sheridan proposed to boyfriend Kurt Roberts during the opening night of the Hughman stage show;[37][38] their separation was announced in November 2021.

[39] He has been close friends with his Packed to the Rafters co-star, Jessica Marais, since they studied together at NIDA.