I've got broadband without a landline here in Spain. It's run by a wireless WAN - the transmitter is about 25kM away.
So yes it's possible - but whether there's suitable service in your area is another matter.
2-way satellite - very expensive
1-way satellite, with your upwards connection via telephone (OKish for downloads.)
WAN wireless - only if there's a service where you are.
Broadband over the electricity distribution - only if there's a service where you are
Broadband via a mobile phone service connection (ask Orange) - expensive, but getting better with flat-rate plans.
You'll have to look into each one for the area you live in.