For positions in mathematics education in north America, you could try:

Canada: https://cms.math.ca/Employment/

USA: https://amte.net/resources/joblistings

USA: http://sigrme.org/open-positions/faculty-positions/

For mathematics education positions in the UK, you could try using the search facility at:

https://www.jobs.ac.uk/

Good luck!

You can also look for Mathematics Education positions at the following websites.

https://amte.net/resources/joblistings

https://www.mathclassifieds.org/jobseeker/search/results/

All the best with your job search.

Eric Hsu's website (which was created in cooperation with the SIGMAA on RUME group) lists multiple resources for positions in mathematics education as well as more general resources:

http://bfc.sfsu.edu/cgi-bin/hsu.pl?Math_Education_Job_Search_Resources