It will be hard to find online, but if you live in a producing area, it will be easy to find it after you know the producers of the winery (try not to be a big producing area like Marburg).

Another option is to put your resume in a big company, such as Lion and Pernod Ricard, the two largest wine companies in New Zealand, which has a better chance. Pernod Ricard is well paid. In addition to the high salary, you will be sent to various wineries and countries for inspection every year (and the inspection will be paid, and the accommodation will be more than 5 stars).