Here are a few links to some sailboat racing games we have found. Some are a simple webpage game, but other require either an app to be installed on your phone or PC to play.
Simple webpage game (Free): http://www.sailracer.net/windgame/
This requires an App or client to be installed to play (Free): http://e-regata.com/eng/
Sail Simulator (Free Demo, price to buy game): http://www.sailsimulator.com/en
SailX has a free trial, but cost after that: http://www.sailx.com/