The alternative would be to use some kind of 4G sensor but those have a tendency to have much shorter battery life. And if 4G with power is needed then it should be equally possible to find a suitable location and put in a 4G capable LoRa Gateway.
The other option would be to connect the sensor to some other LoRa network if there is coverage. Something like Netmore. This is also supported as a provider in IoT Open.