I created this over a year ago when needing a spell-caster that mainly did Psychic spells, specifically for Tekumél as magic is Psychic\Ritual. You’re psychic powers allow you to channel other-planer energies into magical effects. The more powerful effects requiring more complexity, aka rituals, to complete. So a spell-caster who only did psychic made sense. After looking at the Sorcerer’s spell list, there where only a few additional spells that needed to be added to really make them Psychic spell-casters.

I’d also expect the Psychic Sorcerer to take the Metamagic ‘Subtle Spell’ at 3rd level, to truly be able to be a Mind-Mage.

Subtle Spell (PHB 102)
When you Cast a Spell, you can spend 1 sorcery point to cast it without any somatic or verbal Components.

Subtle Spell, when used to eliminate all showings of casting a spell, negates Counterspell, which “requires you to see a creature casting a spell. Nothing to perceive means no counter.” -Jeremy Crawford

Psychic Sorcerer

You specialize in psychic spells. You use thought and emotions as components instead of verbal and somatic components when using your powers, as such your spell list is different from other sorcerers.

EPT Spell List

Any spells you have access to from your temple. Psychic spells cost half as much to learn. Ritual spells still require all other components. A tutor is required to learn any EPT spell.

D&D5e Spell List

Sorcerer spell list plus the following:

Resistance (cantrip), Vicious Mockery (cantrip),  Aid (1st), Animal Friendship (1st), Dissonant Whispers (1st), Bane (1st), Calm Emotions (2nd), Enthrall (2nd), Nondetect (3rd), Sending (3rd), Compulsion (4th), Hallucinatory Terrain (4th), Awake (5th), Legend Lore (5th), Scrying (5th), Forbiddance (6th),Find the Path (6th), Mordenkainen’s Sword (7th), Project Image (7th), Regenerate (7th),  Antipathy/Sympathy (8th), Feeblemind (8th), Glibness (8th), Mind Blank (8th), Power Word Stun (8th), Astral Projection (9th), Forsight (9th), Power Word Heal (9th), Power Word Kill (9th), Weird (9th).

Mental Resistance

At 1st level, your mind blocks attempts to assail it. You have advantage on saving throws against mind-affecting powers such as charms, sleep, and fear. Also, any mind-affecting power against you that doesn’t allow a saving throw fails to work on you (Example. Detect thoughts).

Psychic Attack

At 6th level, you become resistant to Psychic damage. Also, when you cast a spell that deals Psychic damage, add your Charisma modifier to that damage.

Thoughtsense

At 14th level, you can detect the presence of others around you, aware of the location of any hidden or invisible creature. As a constant blindsight effect with a range of 10 feet.

Force of Personality

At 18th level, your presence is so influential that you may replace any Charisma check you make with a 15 (before adding modifiers). You may do this a number of times equal to your Charisma modifier. You regain expanded uses when you finish a long rest.

Resources

Unearthed Arcana: Psionics and the Mystic (2015)
https://dnd.wizards.com/sites/default/files/media/upload/articles/Psionics.pdf

Unearthed Arcana: Psionics & the Mystic, Take 2 (2016)
http://media.wizards.com/2016/downloads/Psionics_and_Mystic_V2.pdf

Unearthed Arcana: The Mystic Class (2017)
http://media.wizards.com/2017/dnd/downloads/UAMystic3.pdf

Psion/Psychic/Mind Mage

Co-creator of D&D 5th edition Mike Mearls shares his process of RPG design. In this episode, Mike dives into Psionics.

Part 1: The Mike Mearls Happy Fun Hour, 4/24/18
https://www.youtube.com/watch?time_continue=2&v=gg6da9eDAOM

Part 2: The Mike Mearls Happy Fun Hour, 5/1/18
https://www.twitch.tv/videos/256928119