Is there any circuit like "Burglar alarm " or "Proximity dector" with a range of 100 meters
There are quite a few PIR circuits, ranging from very simple to quite complex. The better ones use a window comparator setup and adjust for ambient light conditions.

Here is a page full of PIR circuits, and another good page from LadyAda. An app note detailing some common circuits.

Here is one pretty typical circuit (from this page):



Here is about the simplest circuit:



And one that appears to have ambient light compensation (notice phototransistor at bottom left)



Have a read through the tutorials/links and then have a browse around for circuits, there are literally hundreds of examples out there, some better (and better explained) than others. Choose your lens carefully - if you don't want a typical wide angle security type detector, then I think this will be crucial to getting good results. Experiment with a few options to see what works best.
The PIR sensors (component only) are available from places like Farnell, Mouser, LadyAda, etc. Or you can purchase ready made modules from various places.