What you want is an RF remote (radio frequency). Most remotes are IR (infrared) and require a line of sight between the remote and the device being controlled. The RF use radio signals so it doesn't require line of site.
You can also use remote extenders which convert the IR to RF, transmit to the other room, and convert the RF back to IR. Here's several examples of products you can use.
[Link: smarthome.com]