Normal router should work fine, as long as you are not expecting it to do the physical layer SDSL connection. Connection would be:
SDSL Equipment -- Router -- LAN
I only say this because it is so common to find combined ADSL modem, router, switch, firewall thought of as just an ADSL router. I have seen a router (ASA 5505) do the PPoE negotation which would normally be handled by the ADSL equipment, but the ADSL modem was still required.
Aside - is "ADSL modem" the correct name for the bit that talks to the phone line?