Try replacing the seat belt buckle on driver side and also check for recalls on that problem
Why Would The Airbag Indicator Light Stay Lit On 2003 Hyundai Tiburon GT?
You most likely have a sensor problem or a problem with the airbag, as this is why there is a light for the air bag. Unless you have the expertise to find and replace the sensor you will most likely need a repair shop that can fix this problem for you.