Answer : It depends on what you mean by "kitchen designer." A kitchen designer could be someone who simply helps you layout your kitchen and choose the right appliances, or it could be someone who designs custom kitchens.
If you're looking for a career as a kitchen designer, then the answer is no. Kitchen design is not a field that typically requires a degree, and there are not many jobs available in this field. There are far more people who are interested in becoming kitchen designers than there are jobs available, so competition will be fierce.
However, if you're just looking to become better at designing your own kitchen, then yes, absolutely! Taking some courses or reading up on the subject can help you in this endeavor.