I am wondering if I take photo's on a moultrie trail cam with an SD card can I veiw them on my sony digital camera?

It is unlikely that you can just use one SD card and move it from camera to camera, because they likely use a different file structure for each camera. However, if they both use the same file structure (e.g. they both put the photos in a DCIM folder) then it might work.

There is no way to know for sure until you try. If it doesn't work to move the SD card from camera to camera, then follow these steps:

1) take photos with the trail-cam
2) save the photos to your computer
3) take 1 photo with your sony digicam
4) connect the SD card from your Sony to your computer.
5) look at the file structure on your Sony SD card. Usually there is a folder for the digital photos - on a Canon camera this folder is called DCIM. The actual pictures are in this folder
6) copy the photo (from your computer, from the trail-cam) to the photo folder on the SD card
7) put the SD card back into your sony digicam. The trail-cam photos should appear along with the photo(s) already on the Sony card.