Is there a way to enable monitor mode on my Samsung SM-G350 device?
This is something I also wanted on my Nexus 5, but after doing some research  I found that for enabling monitor mode on your android device your chipset must have monitor mode. In case the chipset doesn't support it, its not that easy to get this enabled. The supported chipsets as of now are broadcom 4329 and 4330 WiFi chipsets.
Though for Nexus 5 by making some modifications in the kernel, some developers on XDA found a way out. What seems the reason for getting it specifically for Nexus 5 is that this device still has development going on till date.
For your device unfortunately its chipset doesn't come up to be supporting monitor mode.