Analysing a band pass sallen key filter
You can use modified nodal analysis to solve for all unknown node voltages and unknown currents. 
Once you get the node voltage, you can find the transfer function.
For the analysis, I denote node and current as in the picture below.



Now you can write KCL for every node and a constraint by OpAmp. 

You can get 7 equations:



Then you can solve 7 equations to get all unknown voltages and unknown currents.
Finally transfer function is just V5/V1.