Since the COVID – 19 virus is spread by droplets when someone who has it sneezes or coughs, it is highly unlikely that purchasing a car shipped from overseas would be contaminated. The CDC does believe you can get the virus from touching a surface that has been contaminated, but the length of time it takes for a vehicle to be shipped from overseas should kill any germs on the vehicle.
Even cars that are manufactured in the USA take a long time to get from factory to dealerships so any contaminated surfaces should be fine before anyone purchases the car. However, any time someone gets into the car, it is possible that they are spreading germs.
It is more likely that you will get the corona virus from someone who drove the car than from the manufacturer. For this reason, you should always ask the dealership about their disinfecting process and whether the vehicle has been sanitized before you test drive it.
There is little reason to be concerned about where your vehicle was manufactured as the COVD-19 germs will not survive the trip from another country or sitting in a warehouse in the United States waiting to be shipped.