I do not see the need for any such SOP. You should have a general policy stating that you will train your personnel sufficiently and frequently to ascertain they remain qualified for performing the functions they do.
You should then set up training schemes for every different function within your company.You could set up a matrix containing all SOP's against the different functions within you company. Maybe it is this matrix and the schemes per function that you want to put in a kind of SOP.
It sounds like you intend to write an SOP for managing and documenting the training of employees. You are on the right track, as I would of recommended you write a SOP that defines and describes the training requirements as well as the steps necessary to manage and document the training. If you are using an electronic system to track your training, you will need a SOP for the use of that system as well as a SOP for the Administration of the system.