mahmud and MassageUK - I guess both of you are playing "double M" joke...hahaha. mortenhs is seeking for natural (beaches) spots in SE Asia in this thread and let's get back to our main point.
As far As I know,
Borneo offers a lot of sandy beaches as well as east coast in Malaysia. I heard Boracay Island in Philippines is very nice. Bali is another mass attraction as well as islands in South Thailand...