How do I amplify an IR Sensor ?

Although not designed for long distance, it seems possible as it has a wide bandwidth photo-transistor and daylight filter. I would start by getting 1 small flat black tube about 1 inch long (could be 1 piece of heat-shrink tubing) and fit the tubing over the photo-transistor. This will make the sensor more directional, but much more capable of sensing long distance.

Aim the sensor module at a dark object 1 meter away. Using the circuit below, try different values for R2 so that your A0 reading is somewhere between 100 and 200. I suspect R2 would be some value between 1MΩ and 100KΩ.

Now when a light coloured or reflective object 1 meter away is sensed, the value at A0 should increase.
(completely untested, but might be worth trying).