Hello ayaym,
That is a pretty broad description. You may need to narrow down your questions to be more specific.
It seems like you are doing 2 things. One is create a wireless network. Two is access that network over the internet.
1. Wireless, there are numerous commercial wireless technologies. Wireless ethernet, Wi-Fi, proprietary protocol wireless boxes. Zigbee, wireless HART, bluetooth. Etc....... What makes the most sense would be determined by how these sensors would be connected in a wired world. Then look at the common factors and whether you can adapt all the devices to a common wireless system. For instance, if it's ethernet, you could add in wireless ethernet routers. If it is RS-485 or RS-232 serial protocol, they also make ethernet boxes that would turn these into to remote virtual ports.
2. Internet connectivity. Labview has remote panels and web publishing that would allow remote access to the front panels of running VI's. It is just a matter of allowing those communications to occur in a secure way. A Virtual Private Network might be required. Other remote desktop software tools could work.