There is no direct equivalent in ASL for the English word "consequence" but there are quite a few ways to express the exact concept that you are trying to convey.
Perhaps the sign that is most often chosen to mean consequence is the sign that is commonly labeled (glossed) as "END."
The sign for "END" is often used to mean things like "result," "outcome", or "consequence."
See: END
Some other ways to express the concept of "consequence include:
IMPACT
Notes: