Be aware you will need a stone piling mat
No you don't. Vibro sheet pile wit the vibro head on a tracked excavator arm. Speak to Dawson Wam or similar for info. Vibro will be easy to install in running sand, but vibration monitoring will be necessary as sand transmits the vibration more than most soils. Will have to be OK'd with enviro chaps first.
(use more PPE than this lot though)