WordPress multisite redirect one custom non www domain to www

You could try a rewrite rule just for his domain

RewriteEngine On
RewriteBase /
RewriteCond %{HTTP_HOST} !^www\.somedomain\.com [NC]
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

updated my answer because I misread the question.

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