I am on a PSW visa here in the UK. Can I bring my spouse from India on a PSW visa?

If your wife is already in the UK as your dependent and you are the main applicant, you can both apply for a PSW visa at the same time. If you are already on a PSW visa, then your wife will not be entitled to come and join you in the UK. Instead, you will need to switch into the Skilled Worker Visa category, which will then allow your wife to come and join you in the UK.