Unfortunately not, natural draft water heater requires a chimney to create draft, without a chimney exhaust gasses might spill into your house. You can find details about venting such water heater by following this link - http://www.checkthishouse.com/49/water-heater-vent-pipe.html.
An induced draft / motor assisted draft water heater should be used when venting through the side wall.
Also, a natural draft water heater cannot be modified for use with a motor that induces draft unless it has been specifically designed for that purpose.
Please let me know if you have any other questions.