Unfortunately the 8843 Form alone cannot be e-filed and must be submitted on paper. However if you have e-filed your federal tax return that has the 8843 included then you're not required to mail it separately.
Info: How can I know if form 8843 is included in my federal tax return? You can download your tax return from your account. The 8843 Form is usually included in the last pages of the federal tax return package.