How to Motorize the LEGO Mars Rover
With some minor adjustments, you can try adding Lego Power Functions to your Technic parts.

With the appropriate parts, you can motorize your wheels with motors then remote control them with the Infrared Sensor with remote control. It would be rather tight though as sets that can allow space for these functions will show the option for Power Functions on the box. This means that the Lego Mars Rover set might not be compatible with this set unless you can add some major adjustments or make a rover yourself!

You can find pieces and their details here: http://powerfunctions.lego.com/en-us/whatis/default.aspx#HowDoesPFWorkContentProvider