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There are 3 ways to calculate SEM. Also it is important if you want to have SEM agreement or SEM consistency. I will show you the SEM calculaton from reliability. First you should have ICC (intra-class correlation) and the SD (standard Deviation). Then you calculate SEM as follows: $$ SEM= SD*(\sqrt{1-ICC}) $$.
The result is the total error of measurement, which is a form of typical error contaminated by change in the mean. On its own the total error is not a good measure of reliability, because you don't know how much of the total error is due to change in the mean and how much is due to typical error.