Have you seen this forum? Perhaps it can help you make it happen:
Hi iosman.
It is possible to add more I2C sensors to the Razor M0, but sadly we do not have any example code showing how to do that. The Razor M0 does put I2C on a different set of pins than most SAMD21 boards so make sure you setup your SERCOMs to point to the correct pair of pins. (Check the [schematic to see which ones and also have a look at the [SERCOM tutorial for more information on setting up your I2C pins)](https://learn.sparkfun.com/tutorials/adding-more-sercom-ports-for-samd-boards/all)](https://cdn.sparkfun.com/assets/learn_tutorials/5/6/7/sparkfun-9dof-razor-imu-v30-schematic.pdf)