Cisco Router behind 3G Modem

Hi;

We want to connect a branch to the HQ, in HQ we’ve DSL connection use Cisco Router 887, in the branch we’ve not DSL availability, so we bought a 3G Modem (by SIM Card) to get Internet.
the question: Is it available to connect the 3G modem with a new Cisco router in the branch and make a VPN with the HQ?
Cisco Router(Branch)—-3G Modem—-[[Internet]]———Cisco Router(HQ)

Please help.