Sharman started acting as a child at the age of nine. He auditioned for the Royal Shakespeare Company and was selected out of hundreds of other children. "I just adored it," he said of his venture into the dramatic arts. "Between Macbeth and Henry VI with all of the armour and the blood and everything, it was just fantastic as a kid. It was the best thing ever." Sharman stayed with the Royal Shakespeare Company for two plays: The Park in 1995 (age 9) and Macbeth in 1996 (age 10). He also acted in the touring play The Winslow Boy in 2002 at age 16. Sharman attended the private boarding school Mill Hill School, where he was known as Dan Sharman and also the Arts Educational School, both in London. During his school years, he acted in the play "Kvetch" that made it to the famous Edinburgh Fringe festival. For three years, from 2004 to 2007, Sharman studied at the London Academy of Music and Dramatic Art, gaining a Bachelor of Arts degree in acting. Sharman's first feature film role was in the independent film The Last Days of Edgar Harding, in which he played a musician. In 2010, he was cast as Ares, the Greek god of war, in the fantasy film Immortals with Mickey Rourke, Kellan Lutz and Henry Cavill among others; the film was released in 2011. "I found acting on film really difficult," he admits of his first screen performances. "I found it really kind of odd and unnatural. Then I became obsessed with trying to get it right. I'm hugely competitive." Sharman appeared in the horror film The Collection with his fellow Teen Wolf cast member Eaddy Mays, released in November 2012.
Was in a relationship with Crystal Reed from 2011 to 2013.