I'm assuming you're using a UN**ES8000, where the ** indicate the screen size. Yes, you can use another keyboard. In fact, you have three options:
1) You can many USB, HID-compliant keyboards from off the shelf at any electronics store.
2) You can use the Samsung keyboard: http://www.samsung.com/us/video/tvs-accessories/VG-KBD1500/ZA
3) You can use a tablet or smartphone; you can use the appropriate SmartView app:
Android tablet: https://play.google.com/store/apps/details?id=com.sec.smartview.tab.tz&hl=en
Android phone: https://play.google.com/store/apps/details?id=com.sec.smartview.tz
iOS device: https://itunes.apple.com/gb/app/samsung-smartview/id359580639?mt=8
Can anyone recommend the keyboard options that can be used with the Samsung ES8000 model. Is there a way to use a Samsung Galaxy Tab2 as an option?