Yes, but it's not quite as simple as registering cars and shipping them to customers. The cars need to be serviced, which means opening service centres in the destination market, and hiring skilled staff to do the servicing.

Since Tesla doesn't sell through dealers, they also usually open a sales centre / Tesla store (which often also acts as a service centre).

In Tesla's case, they also invest in building superchargers in the countries they operate in. All of this adds up to a fairly significant capital investment before they start selling vehicles in a new country.