Digital Band pass filter on Arduino
A band pass filter simply means that it a filter between a certain interval of frequencies thus it can be made from a high pass filter and a low pass filter

e.g. this fact is mentioned here http://www.electronics-tutorials.ws/filter/filter_4.html

as well as lots of other web pages which a search by you can find.
So yes a band pass filter can be implemented on arduino if you can implement the corresponding high pass and low pass filter too.