The WizFi210-EVB is designed to connect to a PC via its DB-9 connector. How do you plan to connect the PIR sensor? It will get awfully expensive if you plan to use another WizFi210-EVB to provide it with WiFi.
Does your LAN have a WiFi router? If so, you only need a WiFi interface for the sensor but the WizFi210-EVB is both costly and poorly suited for that as you would have to un-covert the RS232 levels/polarity (or use Debug/DebugIn). You would be better off designing your own PCB for the WizFi210 plus whatever PIC you wish to use which really depends on what else you need the PIC to do.
The WizFi210/220 have several pins (ADC, DIO) that you can probably use to connect directly with the sensor w/o need of a PIC. Download the documentation from the page I referenced earlier in the thread. One of the application notes appears to show getting data from the module using HTTP although it does not provide sufficient detail to be sure. You probably should be communicating with WizNET rather than posting questions here.
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