Yes, Suja juice can be combined with a Paleo diet.
You may want to double check the ingredients of the specific Suja Juice drink you want to purchase, but overall they are made from 100% natural ingredients so that should comply with the paleo diet ethos quite nicely.
I've also been getting into juice cleansing lately (so not just Suja Juice, but various brands), so if that is something that might interest you after your initial experience with Suja Juice then let me know and I can share more info about that.
I am also digging paleo and trying to do some basic weight and strength training recently.
Right now I am connecting with a lot of bloggers, one of whom is my friend Tiare who has recently done a video about Juice cleansing which you will probably enjoy: