In 2022, Costa was nominated as the Best Director and Best Script Writer at the Raigam Tele'es Awards 2020 for his television series Can You Hear Me?
He then began directing and script writing the television series Romeo Juliet which aired on Sri Lanka Rupavahini Corporation.
In 2007, Costa directed his next television series Siri Sirimal with 39 episodes that were telecast on Sri Lanka Rupavahini Corporation.
[17] In 2011, Costa began working on his television series Pinsara Dosthra which was an adaptation of the novel Strange Case of Dr Jekyll and Mr Hyde written by the Scottish author Robert Louis Stevenson.
[18] In 2015, Costa started directing his teledrama Piyasa which was telecasted on Independent Television Network.
[19] Sudu Andagena Kalu Awidin is the most recent teledrama that was directed and written by Sunil Costa.
In 2020 Costa was nominated as the Best Director and Best Script Writer of the year 2019, including another 14 nominees at the Raigam Tele'es award ceremony for the teledrama Sudu Andagena Kalu Awidin.
[31][32][33] In 2020, Costa was nominated as the Best Director and Best Script Writer at the Television State Awards for his television series Sudu Andagena Kalu Awidin including several other nominations[20][23] In 2020 Costa directed the thriller TV series Can You Hear Me?.
The TV series aired in Sri Lanka Rupavahini Corporation on weekdays from Monday to Thursday.The plot talks about different groups of the society that has been systematically ignored by the majority of the public.