the only airline to fly that route is/was PMT airways, but after one of their aircraft crashed on this route in the summer killing everyone it has been stopped
couple of otions really,
1) bus, to PP and get another bus or taxi from there
2) taxi from SR to SHI
3) fly to PP, and taxi/bus to SHI from there
Siem Reap to Sihanoukville is a long trip in a day so I would recomend the Mekong Express Limousine bus, this has more leg room, a toilet on board, some snacks and water (free) and they don't play Karaoke!
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