The British National Television Awards nominated her for best "Drama Performance" for her portrayal of Nurse Mari in ITV's The Good Karma Hospital.
[6] Her successful performance brought her positive reviews and several accolades, including the Best Actress award at the 2004 International Film Festival in Spain.
In 2020 she played the female lead in Deepa Mehta's film Funny Boy based on Shyam Selvadurai's book of the same name.
Her performance garnered rave reviews: "Accomplished British-Sri Lankan actress Nimmi Harasgama (also seen in August Sun and the short I Too Have a Name) stands out as the bold, married Nalini..."[8] In 2023, she collaborated with Bafta-winning Welsh director Philip John to co-write the cross-cultural romantic comedy film "Chennai Story."
The movie, which is directed by Philip John, features Indian superstar Shruti Haasan and rising star Viveik Kalra in leading roles.