Unfortunately not 100% effective, but suggestions that have proven to be helpful;
1. Coach out on the field yelling (Initial incident only): Go to the coach, on the field. Stop, look at his face for 1 second, then continue moving to the sideline where you stop and wait for him to come to you. Patience is a virtue, so wait him out as long as possible. When your patients wears out, if necessary, then beckon him. When he arrives BEFORE he says anything (or stop him if he comes talking) and as politely as possible explain calmly, "When ever you need my assistance, simply inform your wing official, who will alert me and I will come to you on this sideline. NEVER come out on this field without permission, or you'll force me to do something I don't like doing." Then simply ask, "How can I help you?".
If he raises his voice, gestures (or other theatrical nonsense) stop the conversation, and again as calmly and professionally as possible, advise him there is need for shouting or theatrics, and none will be tolerated.
2. It's always a good practice to keep the conversation between you and the Coach (ONLY), although having a crew member close enough to "witness" the discussion may prove valuable if a game report becomes necessary. (More than likely Asst. Coaches and/or players may be in the vicinity - BUT they are NEVER allowed to participate, unless YOU invite them to).
YOUR decision (or that of your crew member you agree with) is ALWAYS final, (subject to YOUR reconsideration) although it's appropriate for you to listen to and evaluate any relevant, additional information provide by the Head Coach. Explanations as to why your decision should remain, can be helpful in reducing confusion and calming the situation, but according to rule YOUR decision is ABSOLUTE & FINAL.(pending whatever post-game review may be available in your area).
Coaches are REQUIRED to RESPECTFULLY accept and abide by your decisions (whether they agree with them, or not). If necessary, "Please don't force me to do something I don't like doing", may be a helpful and worthwhile, gentle reminder to avoid further distractions.