I'm surprised that tidal locking happen for a planet with liquids on the surface, except in a jury-rigged toy scenario. I'd expect that the energy would cause fluid/molden volumes to circulate. This would create motion relative to the energy source.

It might be possible to use this same kind of circulation effect to have a self-contained space-craft. It would consume solar energy, and then strategically pump volumes of fluid from one end to the other, to deliberately change its momentum.