Hi,

You can pass the current record id in the context while opening the wizard as below:

return {
        'name': self.name,
        'res_model': 'your_wizard_model',
        'type': 'ir.actions.act_window',
        'context': {'active_id': self.id},
        'view_mode': 'form',
        'view_type': 'form',    
        'target': 'new', 
    }

Then you can access the record id from the context as active_id and then later pass the active_id in your product search domain:

active_id = self.env.context.get('active_id')

model = self.env['product.template'].search([('id', '=', active_id)])

Hope this solution will help you

For more details on active_id in odoo refer this link: https://www.youtube.com/watch?v=icl4IEWWmuU

Thank you