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Are you not expecting to see some sort of sheathing behind the siding? In order to spray foam properly from the outside you would need to see bare studs, and spray foam in the stud cavities. So that would leave you without sheathing, so you would need to re-install sheathing or at least wind bracing if we are understanding you correctly. To re-install siding afterwards you would be wise to create an air space so the exterior of the wall can dry. Here is our how to install siding properly video, and another on how to install a weather barrier. And read here for more information about choosing breathable weather barriers.
Most specifically, read our guide page to find the best way of installing exterior insulation to the walls of homes here
Let us know more details about our wall assembly and what is behind the siding if you'd like, and we may be able to be more helpful.