Can i replace the tires and rims of my 2003 hyundai elantra with another cars?

A tire store would be able to tell you what "aftermarket" rims would fit. If you want to upgrade cheapest see what alloy rims were an option for your Hyundia and try to locate a set in a wrecking yard. Make sure any rim you put on the car clears the brake calipers and has the same offset or the tires may fowl the fenders or bind on turns.