Finding a good video on tieing a man's sorong is a bit hard to do... Many of the videos are actually about the Burmese Longi...which is a fabric "loop"...closed on the ends...
The Bali and Indonesian Sorong is an open ended piece of fabric and is different from the Burmese Sorong sometimes called a "Longi" or "Lungi"... There are also numerous Polynesian versions of this garment...
The best video on men's sorong tieing that I have found is in this link on YouTube...
CLICK HERE