I'm not sure I understand what you're asking, but I'll take a shot at it...
Are you asking if you can use the USB port on your cable modem to provide Internet access to your PC, or are you asking if there is a way to use it to SHARE Internet access to multiple PCs?
For one PC, yes, that's exactly what the USB port on the modem is designed for. Just plug it in to an available USB port on your PC and follow any configuration instructions your Internet provider gave you for their system.
For sharing to multiple PCs, yes and no. You can connect the USB port on the modem to one PC and then use Internet Connection Sharing from that PC to provide Internet access to other PCs on your network, but the PC connected to the modem will have to be turned on whenever any of the other computers need to use the Internet. You cannot connect the USB port on the modem to a router for Internet sharing (at least, not any router that I have seen). For that type of set up, which would be preferable over an ICS set up, you'll need to use the Ethernet/LAN port on the cable modem and connect it to the Internet/WAN port on a broadband (cable/DSL) router.