I am using EV3 with Linux V1.09 and I am doing a project in which I want to send the sensor data from the EV3 to a remote web server using POST method - is this possible?
Another possible method is to use I2C to communicate from the EV3 to an Arduino with a WiFi shield or module, then have the Arduino perform the POST.
Yes, it is possible.
If you are using the official LEGO firmware, you will need a computer that reads data from the EV3 using direct commands, then relays that information to the web server.
The EV3 could send the information directly if you use a 3rd party OS for EV3, such as ev3dev or leJOS.