I was just wondering if it is possible to link more than one sensor to arduino UNO and if its possible, how would you do it?
If you have enough pins for that particular sensor then yes it is. Just wire it up as you normally would using a different pin and code for it accordingly.
Or, further to what tammytam correctly says, if they work on I2C for example, then you just connect a bunch of them on the same 2 wires (a4 and 5 for a Uno). Only limitation is that they must have different addresses.
For a better answer, you’ll need to ask a better question: what sensor/s did you have in mind?