Then how about the ultrasonic ranging module? what the method to simulate it???
Not everything can be simulated in a simulator. If the sensor is analog in nature, you can simulate with a pot or a preset connected to an op-amp or the ADC of the pic directly, if the output from the sensor in in the 0-5V range.
May be one day Proteus will come out with a printed board which accepts all kinds of sensor including Xbee, RF modules, bluetooth and load cells with an USB output to the PC. The proteus program would detect the devices and display them as icons on the schematics on the ISIS screen.
At the moments there is only LDR, temperature sensor like LM35 and touch-pad but I think that is considered a lot of improvements as compared to the older versions of proteus. BTW did you try Multisim? What kind of sensors do they support?
Allen