[1][2] Particularly acted in cinema in villain roles, Munasinghe was the first stunt director of the Sri Lankan silver screen.

In Nawajeevana studio, he performed his maiden cinematic appearance in the film Ma Ale Kala Tharuniya.

His major breakthrough in cinema came through as the stunt director in the 1964 film Sithaka Mahima directed by M. S. Ananda.

In the 1975 film Rajagedara Paraviyo by Sathischandra Edirisinghe, Munasinghe along with fellow stuntman Alexander Fernando created good realistic fight scenes.

Among the characters played by Munasinghe were the scenes where the lead actress was tortured most notably in the film Awa Soya Adare.