This then will be a very constructive way to train and will help you to improve your technique without being out there.
What wakeboarding really requires however is a sense of balance, and a sense of connection to the board. One way to do this is to try practicing on a skateboard, which while quite different will give you the basic feeling of wakeboarding but on land where it will be much more convenient. Not everyone as they get older will be in to skateboarding however, even if they do like wakeboarding, and the too really are very different (there are no waves in a skate park for example). An even simpler way to train and to help learn to wakeboard then is with an exercise balance board. These you simply stand on and try to keep your centre of gravity down and this will help to develop your balance.
What this also does that will help you learn to wakeboard though is to strengthen your core muscles.