Dinithi Sewwandi Walgamage was born on October 30, 1991, in Galle, Sri Lanka. She belongs to the Sinhala community and speaks Sinhala and English. She studied at Sanghamitta Balika Vidyalaya in Galle before continuing her higher education at Bangalore University in India, where she studied Biotechnology. She later completed studies related to Microbiology, MBA, and Early Childhood Teaching. Dinithi currently lives in Colombo and is also associated with SriLankan Airlines as an air hostess. She is active on Instagram under the username dinidonie, where she has over 520K+ followers. On TikTok, she is active as dinidonie with over 100K+ followers and more than 850K+ likes.
Dinithi started her acting career at a young age and made her cinema debut in the Sinhala movie Aksharaya in 2005 as a child actress. She later appeared in films including Ashawari released in 2022. In television, she became known for teledramas such as Haara Kotiya, Hiru Awidin, and Shadow. She also appeared on television programs including Sirasa Film Star and gained further popularity as a presenter connected with The Voice of Sri Lanka. Along with acting, Dinithi has worked as a model, television host, and social media influencer. Her work across television, cinema, and digital media helped her become a recognized personality in Sri Lankan entertainment.
In her personal life, Dinithi Walgamage married Sangeeth Satharasinghe in 2023. She often shares content related to travel, food, beauty, lifestyle, and daily routines on social media. Her online presence reflects her interest in education, aviation, entertainment, and creative content creation.