I am able to connect sensors using the GPIO pins.
My Question is:
Is there any possible way to connect any kind of sensors to the raspberry pi via Bluetooth or wifi?
And get the data via the same!
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It's unlikely that a 'normal' sensor module would have a wireless interface baked in. That would massively increase its cost while appealing to a relatively small market segment.
The cheapest, easiest method I'm aware of for adding wireless capabilities to sensors is to use an ESP8266 module, which is basically an Arduino with a WiFi antenna. The entry level modules (ES01) are available for a little over £1/unit from China via Ebay. You would connect sensors to the ESP8266 GPIO pins, relay the data over WiFi, and from there the easiest route to communicating with them would be with something like a Flask program run on the Pi.