One of the government managed tour programmes where one can indulge in photography and a bit of writing is the annual vloggers tour organized by Kerala Tourism. Though not a workshop focused entirely on photography, it is meant for professional vloggers.
Yes, there are workshops organized by travel clubs, individuals and camera manufacturing companies with a focus on travel photography. For this, one needs to search for and find out suitable individual or agencies and decide accordingly. Kerala government does not have ratings or give accreditation to such individuals or agencies conducting such workshops.