system
Given the following post, respond as if you're commenting on Reddit:
human
Outside of choosing a minor what other options help get undergrad applicants into somewhat unrelated master's programs?

Sociology Undergrad student, Graduating spring of 2019, had a rocky start with an undiagnosed learning disability, doing stellar after treatment and discovery.

I'm more curious how I could get into Enviromental sciences  or sustainability programs at the master's level as a current sociology student.
gpt
Get involved with research. Go find the faculty page for the department/field you're interested in moving toward. Read every professor's page, bio, CV, etc. Look for 1) topics that interest you, 2) topics related to your current undergraduate major, and preferably 3) topics that connect those two. 

Reach out to these faculty by email. Brief bio that says you're interested in their research and would love to chat. Meet up with then and ask about their research, tell them what interests you. Tell them your goals and that your like to get involved with their research.

 They'll likely suggest you take XYZ requisite courses to get an understanding of the field. Take them and ask about other things you can do in your free time. Hopefully, they'll eventually bring you on to an existing or new project.