This can be done but it has to be done by hand since Carrara does not have a fluid solver. There will be two parts to the water effect: 1) the base water and motion (this should probably be done using a video clip to drive displacement so you can see the exact location of the waves) and, 2) the foam element which will need to be key framed to match the the wave movement. 

Many programs can create gentle ocean movement but automatic production of water behavior requires specialized fluid solvers like RealFlow (http://realflow.com/) RealFlow functions as a stand-alone adjunct software. Programs like C4D, LW and others use plug-ins to reimport the data. There is not currently a plug-in for Carrara but you could import the keyframed fluid animation and apply smoothing to the objects. This not a fast or cheap process...

Blender does some fluid solving but not for ocean types of objects (and if imported into Carrara, you still have to modify/smooth the objects in each keyframe). Believable water is not an easy CG thing to pull off on a limited budget. ;-)  

Mark