I looked into some cellular modem and satellite options a few years back for mobile plants, but we ended up continuing to work with clients to connect via their networks in one form or another instead as our equipment was pretty consistently connected to customer networks.
Short version is yes, cellular modems can give you the connectivity you want (where wireless service is available). Connection will likely be via some sort of VPN. Others on here have made extensive use of them and shared more details. Some posts that may be helpful:
- Cellular Modems
- MQTT Data Usage - #5 by Kevin.Herron
- Oil & Gas Ideas - #16 by craigb
- VPN Or Public Gateway - #2 by dcamp1
If you can't get wired or cellular connectivity, would something like StarLink mobile work (assuming your equipment is above ground)? It looks like it should soon provide global coverage with a single system at a reasonable per unit cost (much more affordable than anything I could find to cover our equipment on some continents when looking into satellite options years ago).