You can go between Koh Rong and Koh Sdach for $20.
Leaving Koh Rong at 10:45 am (45 minutes), and Koh Sdach at 12:30. (90 minutes)

If you’re going from between Kampot and Koh Sdach, a smaller boat arrives and leaves from the Koh Rong Pier. You’ll have to switch boats for this.

Koh Sdach (Dara Sakor) To Koh Rong Samloem (12:30). 2 hours and $20.

More important information on the front page.

Book a ferry ticket HERE