[3] She is often referred to as the "tear drop" in Sinhala small screen and also Sri Lankan Madhuri Dixit.
Then she attended "Low Country" and Kandyan dancing under a radio artist Mrs. Chitra Kumari Kalubowila at Moratuwa.
At the same time, D. B. Nihalsinghe used Thennakoon for his TV Commercials and then for the role "Amaravathi" in the play Dimithu Muthu and then in 1991 film Keli Madala.
[2] Then she acted in famous tele series Doo Daruwo which was telecast many years on the Rupavahini on Sundays at 8.30 p.m.
[4] Her maiden cinematic experience came through 1985 film Mawubima Naththam Maranaya, directed by Louie Vanderstraeten with a minor role.
[2] In 2008 Raigam Tele'es, Tennakoon won the award for the Best Actress for the role "Tikiri Menika" in serials Handewa directed by Sherly P.
[14][15] She also hosted the psychology television program Sith Giman Hala telecast by TV Derana.