1. Arwind Santos was then included in the line up of RQP Team, a local ball club in Lubao under the supervision of Dennis 'Delta' Pineda, who is a supporter of San Sebastian College-Recoletos Stags and the one responsible for landing the Pinatubo Trio composed of Calvin Abueva, Ronald Pascual and Ian Sangalang in the NCAA.
Arwind Santos arrived at the UAAP scene in 2002 with the FEU Tamaraws where he won Rookie of the Year honors.
Arwind Santos was a candidate to win the Most Valuable Player Award, but was beaten by University of the East star James Yap.
Arwind Santos was named Defensive Player of the Year and was part of the Mythical Five together with season MVP Yap, Rich Alvarez, Paul Artadi, and Reynaldo Mendoza.
Arwind Santos made it to the UAAP Mythical Five alongside Mark Cardona, LA Tenorio, Paolo Bugia and Dennis Miranda.
Arwind Santos was awarded Season MVP and Finals MVP for that season, and was named to the Mythical Five with Mark Isip, Tenorio, Edwin Asoro and Joseph Yeo.
Arwind Santos is one of the only two players in the FEU Tamaraws that had his jersey retired.
In 2003, Arwind Santos made his PBL debut for Viva Mineral Water, a team composed of fellow FEU teammates.
Arwind Santos was adjudged PBL MVP of the tournament and was part of the 2004 Mythical Five alongside former PBA players Jojo Tangkay and Chester Tolomia and teammates Miranda and Isip.
Arwind Santos later signed a deal to play his first three seasons with the team, playing alongside Ranidel de Ocampo, Yancy de Ocampo, and KG Canaleta.
Arwind Santos chose to wear the number 29 since his usual number 19 was already worn by Wynne Arboleda.
Arwind Santos ranked first among rookies in scoring during the Philippine Cup and almost led the Express to a quarterfinals appearance only to lose against the Sta.
Arwind Santos was one of the leading contenders for the Rookie of the Year honors at the season's end with the likes of Sta.
None among the officials confirmed the trade although a highly placed source revealed that Arwind Santos was shipped to the Beermen in exchange for 6'5" power forward Marc Pingris, 6'6" sophomore center Ken Bono and San Miguel's 2010 first round pick.
Arwind Santos led his team to an improbable championship in the Governor's Cup conference over the highly favored Talk 'N Text team who were aiming to complete a rare grand slam.
Arwind Santos won his first-ever MVP award with a total of 2,840 points beating out Barangay Ginebra's LA Tenorio and Talk N' Text's Jayson Castro.
Arwind Santos made it to the Mythical First Team for the sixth straight year and the All-Defensive Team for the seventh straight year.
On October 14,2016, Arwind Santos was recognized during the PBA Leo Awards Night as he was named to the PBA Mythcial First Team.
Arwind Santos later issued an apology via his Instagram and Twitter account.
On November 8,2021, after 12 years with the Beermen, Arwind Santos was traded to NorthPort Batang Pier for Vic Manuel.
On May 19,2022, Arwind Santos signed a one-year extension with the team.
Arwind Santos became the oldest to win Defensive Player of the Year when he won it for the third time in his career.
Arwind Santos was among the players listed as part of the Pampanga Giant Lanterns' roster ahead of the 2023 MPBL season.
On October 5,2023, it was announced that Arwind Santos would make his debut in the Maharlika Pilipinas Basketball League with the team for the first game of their 2023 playoffs campaign.
Arwind Santos suited up for the Philippine National Team a couple of times under coach Chot Reyes in 2006 with the likes of LA Tenorio and Joseph Yeo and competed in the 28th Jones Cup but didn't make it to the final line up in 2007.
In 2012, Arwind Santos was listed to the 16-man pool requested by Chot Reyes to be included in the Smart Gilas Pilipinas 2.0.
Arwind Santos was unable to sign the commitment letter due to the Petron management's disapproval.
On December 9,2005, Umayam gave birth to their first child but barely a month after, Arwind Santos left his wife and child.