Working - Tourist

Sure! You can always search for a job.

However, if you are coming on a tourist visa, you don't have much time. better to search beforehand. 

Take a look here: https://planetyze.com/en/japan/forum/japan/living-in-japan/best-websites-to-find-jobs-and-work-in-japan

You will find good information on the best websites to find jobs in Japan