Umaria is an experienced artist who has released many sinhala songs. Over the years, she has collaborated with numerous singers to create songs with memorable song lyrics that have captured the hearts of audiences in Sri Lanka and beyond.In 2010, Sinhawansa had performed on International Indian Film Academy Awards (IIFA Awards) with BnS. She also shared the same stage with Indian musicians, Asha Bhosle and Shankar–Ehsaan–Loy. In 2018, Umaria got honoured by the Indian Prime Minister Narendra Modi for the song Vaishnav Jana to, a musical tribute to Mahatma Gandhi's 150th Birth Anniversary.
Umaria has featured with Randhir Witana, Ashanthi De Alwis, Devashrie de Silva, Ruwan Hettiarachchi, Sanuka Wickramasinghe in several sinhala songs. Umaria has done several songs with Bathiya Jaykody and Santush Weeraman creating unforgettable song lyrics that have resonated with audiences across Sri Lanka. In 2013, she performed on 2013 Commonwealth Heads of Government Meeting (CHOGM 2013) opening ceremony. In the meantime, she made a duet with prominent musician W. D. Amaradeva, few years before his demise.
Umaria became a judge for the singing reality show, Sirasa Superstar. Then she joined with celebrity reality show "Hiru Mega Stars" for the team "Sooryans" along with Yureni Noshika, Himali Sayurangi, Asanka Perera, Pathum Rukshan, Piyumi Botheju and Akila Dhanuddara. In 2017, she joined with the reality program "Youth with Talent - Generation Next" as a guest judge. In the same year, she made playback singing for the film Bimba Devi alias Yashodhara. After that song, she became an A-Grade singer at Sri Lanka Broadcasting Corporation. She is the youngest to achieve the feat. Then she collaborated with BnS for the album Oba Nisa and toured for the Oba Nisa concert.
In 2019, she made playback singing for the blockbuster Vijayaba Kollaya, directed by Sunil Ariyaratne. During the pandemic, she performed the first Drive-In Concert in Sri Lanka. On 3 July 2020, she released the solo "Manda Pama" , in which song lyrics were written by Manuranga Wijesekara. The song reached 2 million views within first two days and later 10 million views on YouTube. The song also ranked number 1# in iTunes and Apple Music among sinhala songs as well and received international recognition. In November 2020, she joined the coaching panel of the reality show "The Voice Sri Lanka". Umaria is also known for her role as a coach on the televised singing competition The Voice Sri Lanka and she is the winning coach of the season 2021. She also made cameo appearances in the films Dancing Stars and Spandana.