INDIS15, the Second Workshop on Innovating the Network for Data-Intensive Science, brings together the network researchers and innovators to present challenges and novel ideas that stretch SCinet and network research beyond the limits of today's technology. This workshop invites papers that propose new and novel techniques regarding capacity and functionality of networks, its control and its architecture to be demonstrated at current and future supercomputing conferences. It will be held during SC15, the International Conference on High Performance Computing, Networking, Analysis, and Storage (http://sc15.supercomputing.org) November 15-19 in Austin. Wide-area networks are now an integral and essential part of the data-driven supercomputing ecosystem connecting information-sources, processing, simulation, visualization and user communities. Every year SCinet develops and implements the network for the SC conference. This network is state of the art, connects many demonstrators of big science data processing infrastructures at the highest line speeds with the newest technologies available, and demonstrates novel functionality. The show floor network connects to many laboratories and universities worldwide using high-bandwidth connections.