The short answer is No.
The longer answer is that a WSN node uses a fixed function radio with a full protocal stack. The USRP is a general purpose radio covering a common set of frequencies however a fully functional turnkey stack does not exist. Could it be designed? Perhaps over the course of many focused man-years of development.
The USRP mostly used as a research device. Most research implements a small aspect of a protocol, ususally focused on the physical or MAC layer, and then customizes it and evaluates the results.
The right solution for WSN is a WSN gateway.
Erik
